阅读说明：本技术 一种柴油机机架单片双面双弧同步气保焊焊接工艺 (Diesel engine frame single-piece double-face double-arc synchronous gas shield welding process ) 是由 高兰云 李忠明 欧志文 陈浩 李仁民 曹睿 孙蕾 吕律 王胜林 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种柴油机机架单片双面双弧同步气保焊焊接工艺,解决了现有技术中柴油机机架单片存在焊缝质量差和生产效率低的问题,具有保证焊缝质量,实现不留间隙的全熔透焊接的有益效果,具体方案如下：一种柴油机机架单片双面双弧同步气保焊焊接工艺,包括对柴油机机架单片,打底焊接过程中通过保护气体进行保护以保证打底的母材融化,填充焊接和盖面焊接过程中通过设定比例氩气和二氧化碳作为保护气体,使得每层焊缝的成型与焊接过程中无焊接飞溅,打底焊接、填充焊接接和盖面焊接过程中,焊接电流相异。(The invention discloses a diesel engine frame single piece double-face double-arc synchronous gas shielded welding process, which solves the problems of poor welding seam quality and low production efficiency of a diesel engine frame single piece in the prior art, has the beneficial effects of ensuring the welding seam quality and realizing full penetration welding without leaving gaps, and has the following specific scheme: a diesel engine frame single piece double-face double-arc synchronous gas shield welding process comprises the steps of protecting a diesel engine frame single piece through protective gas in a bottoming welding process to ensure that bottoming base metal melts, using argon and carbon dioxide in a set proportion as protective gas in filling welding and cover surface welding processes to enable forming of each layer of welding seams to be free of welding spatter in the welding processes, and enabling welding currents to be different in the bottoming welding, filling welding and cover surface welding processes.)

1. The double-face double-arc synchronous gas shield welding process for the single diesel engine frame is characterized in that a protective gas is used for protecting a bottoming base metal to be melted in the bottoming welding process of the single diesel engine frame, argon and carbon dioxide in a set proportion are used as the protective gas in the filling welding and cover surface welding processes, welding spatter is avoided in the forming and welding processes of each layer of welding line, and welding currents are different in the bottoming welding, filling welding and cover surface welding processes.

2. A diesel engine frame single-chip double-sided double-arc synchronous gas shield welding process is characterized by comprising the following steps:

supporting a single diesel engine frame sheet through a tool;

backing welding is carried out on the single sheet at a first set current, and protection is carried out through protective gas in the backing welding process to ensure that a backing base material is melted;

after backing welding is finished, filling welding is carried out on the single sheets at a second set current, and double gases are adopted for protection in the filling welding process;

after filling welding is finished, capping welding is carried out on the single sheets at a third set current, and argon and carbon dioxide in a set proportion are used as protective gas in the capping welding process, so that welding spatter is avoided in the forming and welding processes of each layer of welding line.

3. The diesel engine frame single sheet double-sided double-arc synchronous gas shield welding process according to claim 2, wherein the tool comprises a frame, a rotatable rotating shaft is arranged on the frame, a frame-shaped piece for supporting single sheet wing plates is arranged through the rotating shaft, two side edges of the frame-shaped piece are respectively used for supporting single sheet wing plates, and a limiting part for limiting the single sheet guide rail plate is fixedly connected to the inner side of the frame-shaped piece through the rotating shaft.

4. The diesel engine frame single-piece double-sided double-arc synchronous gas shield welding process according to claim 1 or 2, wherein the shielding gas in the backing welding process is carbon dioxide.

5. The diesel engine frame single-piece double-sided double-arc synchronous gas shield welding process according to claim 1 or 2, wherein the ratio of argon gas to carbon dioxide in the filling welding process and the capping welding process is 6.5-8.6: 3.5-1.4.

6. The diesel engine frame single-piece double-sided double-arc synchronous gas shield welding process according to claim 1 or 2, wherein welding voltage in the filling welding process and the cover welding process is the same, and the welding current is larger than the welding voltage in the backing welding process;

the gas flow during the backing weld, fill weld and cap weld are the same.

7. The diesel engine frame single-piece double-sided double-arc synchronous gas shield welding process according to claim 1 or 2, characterized in that in the processes of backing welding, filling welding and cover surface welding, the welding current is increased in sequence;

the welding speed in the cover surface welding process is higher than that in the bottoming welding and filling welding processes;

the wire feeding speed in the process of backing welding is lower than that in the process of cover surface welding.

8. The diesel engine frame single-chip double-sided double-arc synchronous gas shielded welding process as defined in claim 1 or 2, wherein during the backing welding, the welding current is 200-215A, the welding voltage is 26-29V, the welding gas flow is 21-25L/min, the wire feeding speed is 720-780cm/min, and the welding speed is 25-35 cm/min.

9. The diesel engine rack single-piece double-sided double-arc synchronous gas shielded welding process as defined in claim 1 or 2, wherein during the filling welding process, the welding current is 215-225A, the welding voltage is 27-31V, the welding gas flow is 21-25L/min, the wire feeding speed is 840-910cm/min, and the welding speed is 25-35 cm/min.

10. The diesel engine frame single-chip double-sided double-arc synchronous gas shielded welding process as defined in claim 1 or 2, wherein during the cover welding process, the welding current is 218-230A, the welding voltage is 27-31V, the welding gas flow is 21-25L/min, the wire feeding speed is 840-910cm/min, and the welding speed is 48-65 cm/min.

Technical Field

The invention relates to the field of diesel engines, in particular to a diesel engine frame single-chip double-face double-arc synchronous gas shield welding process.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

The existing robot double-sided double-arc welding researches mainly include two types, one type is that a gap is reserved at the root part, pulse TIG welding with good arc stability is adopted for backing, the arc melting capacity during the peak value is strong, the edges at two sides of the root part of a groove are well melted, a molten pool is rapidly solidified during the base value, and the downward flowing is prevented. The method is characterized in that double TIG electric arcs are used for staggered and synchronous bottoming, the high-temperature area of a workpiece between the two electric arcs is increased due to the addition of a rear electric arc, a front electric arc molten pool is elongated, a filling welding cover surface is welded by double-sided double-arc synchronous gas shielded welding, in the application process of the actual robot, when a bottoming welding channel and a filling welding channel are replaced, the welding mode needs to be replaced, the production efficiency can be greatly reduced, and the method is not suitable for production.

The other method is that the gas shield welding is used for dislocation priming, the stability of an electric arc of the gas shield welding is poor, a molten pool can be acted by various forces such as surface tension, electromagnetic contraction force, gravity and the like in the welding process, slight changes of grooves, protective gas, the dry elongation of a welding wire and the like can change welding parameters, the transition form of the electric arc is changed, the one-time inspection qualification rate is not high, and the practicability of the actual production and use is poor.

Therefore, the inventor finds that the two existing welding modes have the problems of low production efficiency and low qualification rate caused by poor welding quality.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a diesel engine frame single-sheet double-face double-arc synchronous gas shield welding process, which can fully improve the one-time acceptance rate of welding seams and improve the production efficiency.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a diesel engine frame single piece double-face double-arc synchronous gas shield welding process is characterized in that a shielding gas is used for protecting a bottoming base material to be melted in a bottoming welding process of a diesel engine frame single piece, argon and carbon dioxide in a set proportion are used as the shielding gas in a filling welding process and a cover surface welding process, so that welding spatter is avoided in the forming and welding processes of each layer of welding line, and welding currents are different in the bottoming welding process, the filling welding process and the cover surface welding process.

In the welding process, in order to ensure the qualified rate of welding seams and improve the production efficiency, double-sided double-arc full penetration welding without a gap between single sheets of a diesel engine frame is realized, and welding guns on two sides of the single sheets are required to melt base metal in the bottoming welding process to realize full penetration, so that the bottoming welding is protected by protective gas, and the melting of the bottoming base metal can be effectively ensured; in the filling welding and cover surface welding processes, argon and carbon dioxide in a set proportion are used as protective gas, so that welding spatter can be avoided in the filling welding and cover surface welding processes; meanwhile, the welding current parameters are set, so that the welding seam quality is guaranteed integrally.

In a second aspect, the invention also provides a diesel engine frame single-chip double-sided double-arc synchronous gas shield welding process, which comprises the following steps:

supporting a single diesel engine frame sheet through a tool;

backing welding is carried out on the single sheet at a first set current, and protection is carried out through protective gas in the backing welding process to ensure that a backing base material is melted;

after backing welding is finished, filling welding is carried out on the single sheets at a second set current, and double gases are adopted for protection in the filling welding process;

after filling welding is finished, capping welding is carried out on the single sheets at a third set current, and argon and carbon dioxide in a set proportion are used as protective gas in the capping welding process, so that welding spatter is avoided in the forming and welding processes of each layer of welding line.

As above a diesel engine frame monolithic double-sided double-arc is synchronous gas shield welding process, the frock includes the frame, and the frame setting can the pivoted pivot, passes the pivot setting and is used for supporting the frame type spare of monolithic pterygoid lamina, and the both sides limit of frame type spare is used for supporting monolithic pterygoid lamina separately, passes the pivot and links firmly in the inboard of frame type spare and is used for carrying out spacing stop part to the monolithic guide rail board, after the monolithic passes through the frock support, can drive the rotation of frame type spare and stop part through the pivot, and then drive the monolithic rotation of frame, make things convenient for the installation of monolithic and weld when the frock is horizontal.

According to the diesel engine frame single-piece double-face double-arc synchronous gas shield welding process, the shielding gas is carbon dioxide in the bottoming welding process, the carbon dioxide has the characteristic of large fusion depth in welding, and the fusion of a bottoming base material can be guaranteed.

According to the diesel engine frame single-piece double-face double-arc synchronous gas shield welding process, the ratio of argon to carbon dioxide in the filling welding process to the capping welding process is 6.5-8.6:3.5-1.4, so that the welding spatter problem of each layer of welding line in the forming and welding processes in the filling welding process and the capping welding process is avoided.

According to the diesel engine frame single-piece double-face double-arc synchronous gas shielded welding process, in order to realize double-face double-arc full penetration welding without a gap, welding parameters need to be reasonably selected, welding voltage in the filling welding process and the cover welding process is the same, and the welding voltage is greater than that in the bottoming welding process;

the gas flow in the processes of backing welding, filling welding and cover surface welding is the same, so that on the premise of ensuring the quality of a welding seam, the gas flow does not need to be adjusted in each welding process, and the production efficiency is effectively improved.

According to the diesel engine frame single-piece double-face double-arc synchronous gas shield welding process, in the processes of backing welding, filling welding and cover welding, welding current is increased in sequence;

the welding speed in the cover surface welding process is higher than that in the bottoming welding process and the filling welding process, and the welding speeds in the bottoming welding process and the filling welding process are the same; the wire feeding speed in the bottoming welding process is lower than that in the cover surface welding process, the welding current is lower, the welding speed is lower, the wire feeding speed is lower in the bottoming welding process, and the base metal is fully melted in the bottoming welding process; the welding speed and the wire feeding speed are high in the cover surface welding process, and the problem of welding spatter is effectively avoided.

According to the diesel engine frame single-chip double-face double-arc synchronous gas shielded welding process, in the bottoming welding process, the welding current is 200-215A, the welding voltage is 26-29V, the welding gas flow is 21-25L/min, the wire feeding speed is 720-780cm/min, and the welding speed is 25-35cm/min, so that under the action of protective gas, the welding process is mutually matched to ensure that a base material is melted in the bottoming welding process.

According to the diesel engine rack single-piece double-face double-arc synchronous gas shield welding process, in the filling welding process, the welding current is 215-225A, the welding voltage is 27-31V, the welding gas flow is 21-25L/min, the wire feeding speed is 840-910cm/min, and the welding speed is 25-35cm/min, so that smooth welding in the filling welding process is guaranteed.

According to the diesel engine rack single-piece double-face double-arc synchronous gas shield welding process, in the cover face welding process, the welding current is 218-230A, the welding voltage is 27-31V, the welding gas flow is 21-25L/min, the wire feeding speed is 840-910cm/min, and the welding speed is 48-65cm/min, so that under the action of argon and carbon dioxide gas, the welding current and the welding voltage are matched with each other, and welding spatter is avoided in the forming and welding processes of each layer of welding line.

The beneficial effects of the invention are as follows:

1) according to the invention, the protection is carried out through the protective gas in the bottoming welding process, so that the welding guns on two sides of the single piece can melt the base metal, and full penetration is realized; and in the filling welding and the cover surface welding process, argon and carbon dioxide in a set proportion are used as protective gas, so that welding splashing in the filling welding and the cover surface welding process can be avoided, and meanwhile, the setting of welding current parameters is matched, so that double-sided double-arc full penetration welding without gaps on a single diesel engine frame can be realized, the welding seam qualification rate is favorably ensured, and the production efficiency is improved.

2) According to the invention, the single frame sheet is supported by the tool, the rotating shaft of the tool can rotate, so that the single frame sheet can be conveniently installed when the tool is in a vertical state, and after the frame is rotated for a set angle, the frame can be conveniently welded when the frame is in a horizontal and transverse state.

3) According to the invention, carbon dioxide is selected as a protective gas in the backing welding process, the characteristic of large fusion depth of the carbon dioxide during welding is fully utilized, and the melting of the backing base metal can be ensured.

4) According to the invention, through selecting argon and carbon dioxide in a set proportion in the filling welding and capping welding processes and matching with the determination of relevant welding parameters including welding current, welding voltage and the like, the problems of welding spatter in the forming and welding processes of each layer of welding seam in the filling welding and capping welding processes can be ensured, and the quality of single-piece double-sided double-arc welding is ensured.

5) According to the invention, through giving out relevant welding parameters such as welding current, welding voltage, gas flow and other data in each welding process, not only can the melting of base metal in the backing welding process be effectively ensured, full penetration is realized, but also good forming of the backing welding is ensured; by giving welding parameters in the filling welding process, good molding in the welding process is ensured; by giving out welding parameters in the cover surface welding process, welding spatter is avoided in the forming and welding process of each layer of welding line.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic diagram of a tool in a diesel engine frame single-piece double-sided double-arc synchronous gas shield welding process according to one or more embodiments of the invention.

Fig. 2 is a schematic diagram illustrating the use of the tool in a diesel engine frame single-piece double-sided double-arc synchronous gas shield welding process according to one or more embodiments of the present invention.

In the figure: the spacing or dimensions between each other are exaggerated to show the location of the various parts, and the schematic is shown only schematically.

Wherein: 1. the vertical type rail comprises a vertical column, 2. a frame piece, 3. a cross beam, 4. a wing plate, 5. a guide rail plate, 6. a vertical beam and 7. a fixed disc.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;

as introduced in the background art, the problems of poor welding seam quality and low production efficiency in the welding of the single piece of the frame in the prior art exist, and in order to solve the technical problems, the invention provides a diesel engine frame single piece double-face double-arc synchronous gas shield welding process.

Example one

In an exemplary embodiment of the present invention, referring to fig. 1, a diesel engine frame single-piece double-sided double-arc synchronous gas shield welding process includes the following steps:

supporting a single diesel engine frame sheet through a tool;

backing welding is carried out on the single sheet at a first set current, and protection is carried out through protective gas in the backing welding process to ensure that a backing base material is melted;

after backing welding is finished, filling welding is carried out on the single sheets at a second set current, and double gases are adopted for protection in the filling welding process;

after filling welding is finished, capping welding is carried out on the single sheets at a third set current, and argon and carbon dioxide in a set proportion are used as protective gas in the capping welding process, so that welding spatter is avoided in the forming and welding processes of each layer of welding line.

In the present embodiment, a robot is used to perform double-sided double-arc welding on a single frame piece (prior art).

Referring to fig. 1, the tool includes a support frame, the support frame is provided with a rotatable rotating shaft, a frame-shaped part 2 used for supporting a single wing plate is arranged by passing through the rotating shaft, the frame-shaped part has a set length and a set width, two side edges of the frame-shaped part 2 are respectively used for supporting the single wing plate 4, a limiting part used for limiting the single guide rail plate 5 is fixedly connected to the inner side of the frame-shaped part by passing through the rotating shaft, after the single wing plate is supported by the tool, the frame-shaped part and the limiting part can be driven to rotate by the rotating shaft, further, the single frame is driven to rotate, the single plate is convenient to install and is welded when the tool is transversely arranged.

Specifically, the frame includes two stands 1, and 1 interval of two stands sets for the distance setting, and wherein, the both ends of pivot support through the stand respectively, and the stand passes through the bearing and supports the pivot.

In this embodiment, the limiting part is cross, and the limiting part includes crossbeam 3, and crossbeam 3 sets up in the week side of pivot, and the crossbeam all sets up perpendicular roof beam 6 in the both sides that are close to its one end, and two are perpendicular roof beams 6 to be located the coplanar, and perpendicular roof beam one end is connected with the crossbeam, and there is the distance of settlement between the other end and the frame type inboard.

In other examples, the pivot includes two, and two pivots are supported through the stand respectively, and the one end rotatable the installing in stand of each pivot, and the pivot other end is connected with the middle part of frame type spare side, sets up fixed disk 7 in the pivot, and fixed disk 7 is close to the stand setting, and the fixed disk diameter is greater than the pivot diameter, carries on spacingly through the fixed disk to the frame type spare.

Furthermore, the protective gas is carbon dioxide in the backing welding process, and the carbon dioxide has the characteristic of large fusion depth in welding, so that the backing base metal can be guaranteed to be fused.

It should be explained that the ratio of argon to carbon dioxide during the fill and cap welding is 6.5-8.6:3.5-1.4, thereby avoiding weld spatter problems during the form and weld of each layer during the fill and cap welding.

In this embodiment, as an optimal scheme, the ratio of argon to carbon dioxide in the facing welding process is 8: 2.

In order to realize double-sided double-arc full penetration welding without a gap, welding parameters need to be reasonably selected, welding voltage in the filling welding process and the cover welding process is the same, and the welding voltage is greater than that in the bottoming welding process;

the gas flow in the processes of backing welding, filling welding and cover surface welding is the same, so that on the premise of ensuring the quality of a welding seam, the gas flow does not need to be adjusted in each welding process, and the production efficiency is effectively improved.

In the processes of backing welding, filling welding and cover surface welding, the welding current is increased in sequence;

furthermore, the welding speed in the cover surface welding process is greater than the welding speed in the backing welding and filling welding processes, and the welding speed in the backing welding and filling welding processes is the same; the wire feeding speed in the bottoming welding process is lower than that in the cover surface welding process, the welding current is lower, the welding voltage is lower, the welding speed is lower, and the wire feeding speed is lower in the bottoming welding process, so that the base metal can be fully melted in the bottoming welding process; the welding speed and the wire feeding speed are high in the filling welding and cover surface welding processes, and the problem of welding spatter is effectively avoided.

Further, in order to ensure that the base metal can be melted and good forming can be ensured in the bottoming welding process, the welding current is 200-215A, the welding voltage is 26-29V, the flow rate of the welding gas is 21-25L/min, the wire feeding speed is 720-780cm/min, and the welding speed is 25-35cm/min, so that under the action of the protective gas, the base metal is mutually matched and the base metal is ensured to be melted in the bottoming welding process.

In the filling welding process, the welding current is 215-225A, the welding voltage is 27-31V, the welding gas flow is 21-25L/min, the wire feeding speed is 840-910cm/min, and the welding speed is 25-35cm/min, so as to ensure the smooth welding in the filling welding process.

In the cover surface welding process, the welding current is 218-230A, the welding voltage is 27-31V, the welding gas flow is 21-25L/min, the wire feeding speed is 840-910cm/min, and the welding speed is 48-65cm/min, so that under the action of argon and carbon dioxide gas, the welding current and the welding voltage are matched with each other, and no welding spatter exists in the forming and welding processes of each layer of welding line when the cover surface is covered.

Specifically, in the bottoming welding process, the welding current is 205A, the welding voltage is 28V, the welding gas flow is 23L/min, the wire feeding speed is 750cm/min, and the welding speed is 30 cm/min; in the filling welding process, the welding current is 220A, the welding voltage is 29V, the welding gas flow is 23L/min, the wire feeding speed is 880cm/min, and the welding speed is 30 cm/min; in the cover surface welding process, the welding current is 223A, the welding voltage is 29V, the welding gas flow is 23L/min, the wire feeding speed is 880cm/min, and the welding speed is 55 cm/min; the optimum welding parameters for the backing weld, fill weld and facing weld processes are shown in table 1.

TABLE 1 optimal welding parameters for backing, blanket, and cap welding processes

Example two

The embodiment provides a diesel engine frame single-piece double-face double-arc synchronous gas shield welding process, and for a diesel engine frame single piece, a base metal for bottoming is guaranteed to melt by protecting gas in a bottoming welding process, argon and carbon dioxide in a set proportion are used as the protecting gas in a filling welding and cover surface welding process, so that welding spatters are avoided in the forming and welding processes of each layer of welding line, and welding currents are different in the bottoming welding, filling welding and cover surface welding processes.

In the welding process provided by this embodiment, the related contents are the same as those of the first embodiment except for the tooling.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.