阅读说明：本技术 一种大口径碳钢厚壁管道全位置焊接施工方法 (All-position welding construction method for large-diameter carbon steel thick-wall pipeline ) 是由 魏洛东 李宁 段毅刚 刘群林 曾钦礼 刘辉 舒洪 肖鹏 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种大口径碳钢厚壁管道全位置焊接施工方法,包括以下步骤：步骤A、将碳钢厚壁管道待焊接的部位涂抹碳酸氢钠溶液,冲洗,涂抹烷基苯磺酸盐溶液,并用塑料膜包覆,冲洗,晾干；步骤B、将所述碳钢厚壁管道放置于焊接台上,并利用所述焊接台对所述碳钢厚壁管道进行固定,在所述碳钢厚壁管道外部临时安装一焊接罩；最后进行焊接；本发明焊接工艺简单,焊接效果好,而且降低成本；本焊接工艺包括打底焊、填充焊和盖面焊,三者结合,相互补充,焊接效果更好。(The invention discloses an all-position welding construction method for a large-caliber carbon steel thick-wall pipeline, which comprises the following steps of: step A, coating a to-be-welded part of a carbon steel thick-wall pipeline with a sodium bicarbonate solution, washing, coating an alkylbenzene sulfonate solution, coating with a plastic film, washing and drying; b, placing the carbon steel thick-wall pipeline on a welding table, fixing the carbon steel thick-wall pipeline by using the welding table, and temporarily installing a welding cover outside the carbon steel thick-wall pipeline; finally, welding is carried out; the invention has simple welding process, good welding effect and reduced cost; the welding process comprises backing welding, filling welding and cover surface welding which are combined and mutually supplemented, and the welding effect is better.)

1. The all-position welding construction method for the large-caliber carbon steel thick-wall pipeline is characterized by comprising the following steps of:

step A, coating a layer of sodium bicarbonate solution with the mass fraction of 8% on a to-be-welded part of a carbon steel thick-wall pipeline, covering the to-be-welded part with a plastic film, keeping the coating for 0.5 hour, washing with flowing water, and airing;

coating a layer of alkylbenzene sulfonate solution on the to-be-welded and connected part of the carbon steel thick-wall pipeline, covering the alkylbenzene sulfonate solution with a plastic film, keeping the coating for 0.5h, washing the coating with flowing deionized water, and airing the coating;

b, placing the carbon steel thick-wall pipeline on a welding table, fixing the carbon steel thick-wall pipeline by using the welding table, and temporarily installing a welding cover outside the carbon steel thick-wall pipeline; finally, welding is carried out;

the welding process comprises the following steps: backing welding, filling welding and cover surface welding;

in the backing welding, the pulse base current is 120A, the peak current is 280A, the pulse frequency is 50Hz, the flow of protective gas is 25L/min, and the welding speed is 230 mm/min;

in the filling welding and the cover surface welding, the pulse base value current is 80A, the peak current is 260A, the pulse frequency is 120Hz, the flow of protective gas is 23L/min, the wire feeding speed is 2000mm/min, and the diameter of the welding wire is 1.1 mm;

c, checking whether unwelded parts exist or not, and if so, repeating the step B to perform the welding aiming at the welding until all parts to be welded are completely welded;

wherein the welding station comprises:

the surface of the base platform is provided with a plurality of mounting holes which are distributed at intervals;

the two limiting plates are detachably mounted on the base station through any two mounting holes respectively, and limit and fix two ends of the carbon steel thick-wall pipeline to be welded respectively; the limiting plate is provided with a plurality of limiting grooves; one ends of all the limiting grooves are intersected at the same point;

the limiting rod is detachably mounted in the limiting groove, the limiting rod can move along the length direction of the limiting groove, the limiting rod is moved to a preset position and is locked and limited by the aid of nuts, and accordingly the limiting rod is fixed on the limiting plate and is locked and limited, and the limiting rod is fixed on the limiting plate and is clamped and locked at one end of the carbon steel thick-wall pipeline.

2. The all-position welding construction method for the large-caliber carbon steel thick-wall pipeline as claimed in claim 1, wherein the alkylbenzene sulfonate solution comprises 20-30% of alkylbenzene sulfonate by mass and the balance of water.

3. The all-position welding construction method for the large-caliber carbon steel thick-wall pipeline according to claim 1, wherein the welding cover comprises:

the pair of inner rings are formed by splicing a plurality of arc-shaped pieces end to end, and every two adjacent arc-shaped pieces are connected through an elastic rubber strip; the inner ring is sleeved outside the carbon steel thick-wall pipeline to be welded, and the size of the inner ring can deform along with the size of the carbon steel thick-wall pipeline so as to adapt to seamless connection with the carbon steel thick-wall pipeline;

the pair of outer rings are correspondingly sleeved outside the pair of inner rings respectively, and a foldable outer transparent film is sleeved between the pair of outer rings so as to enclose the gas inside; the outer transparent film is provided with an air inlet for air to enter and an operation port for a welding gun to operate;

and a foldable side transparent film is also arranged between the corresponding inner ring and the outer ring.

4. The all-position welding construction method of the large-caliber carbon steel thick-wall pipeline is characterized in that a welding cover is temporarily installed outside the carbon steel thick-wall pipeline, and the part to be welded of the carbon steel thick-wall pipeline is covered in the range of the welding cover.

5. The all-position welding construction method for the large-caliber carbon steel thick-wall pipeline as claimed in claim 1, wherein before the step A, the part to be welded of the carbon steel thick-wall pipeline needs to be ground until the surface of the carbon steel thick-wall pipeline presents metallic luster.

6. The all-position welding construction method for the large-caliber carbon steel thick-wall pipeline as claimed in claim 1, wherein a layer of rubber anti-slip pad is wrapped on the surface of the limiting rod.

7. The all-position welding construction method for the large-caliber carbon steel thick-wall pipeline according to claim 1, wherein the limiting groove penetrates in the thickness direction of the limiting plate.

Technical Field

The invention relates to the field of pipeline welding. More specifically, the invention relates to an all-position welding construction method for a large-caliber carbon steel thick-wall pipeline.

Background

Carbon steel pipes or carbon steel pipes are usually produced by piercing steel ingots or solid pipe blanks into capillary tubes, and then hot rolling, cold rolling or cold drawing. Carbon steel pipe has an important position in the steel pipe industry of our country, and carbon steel thick wall pipeline is as common engineering equipment, is used widely, all needs to carry out the pipe connection usually in the application, and the pipe connection mainly relies on the welding to accomplish, in the pipeline welding process, can utilize the shielding gas to protect usually, but present engineering construction all directly opens the environment and pours into the shielding gas into, can cause the welding effect not good like this, can cause the waste of shielding gas moreover.

Disclosure of Invention

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided an all-position welding construction method for a large-caliber carbon steel thick-walled pipeline, comprising the steps of:

step A, coating a layer of sodium bicarbonate solution with the mass fraction of 8% on a to-be-welded part of a carbon steel thick-wall pipeline, covering the to-be-welded part with a plastic film, keeping the coating for 0.5h, washing with flowing water, and airing;

coating a layer of alkylbenzene sulfonate solution on the to-be-welded and connected part of the carbon steel thick-wall pipeline, covering the alkylbenzene sulfonate solution with a plastic film, keeping the coating for 0.5h, washing the coating with flowing deionized water, and airing the coating;

b, placing the carbon steel thick-wall pipeline on a welding table, fixing the carbon steel thick-wall pipeline by using the welding table, and temporarily installing a welding cover outside the carbon steel thick-wall pipeline; finally, welding is carried out;

the welding process comprises the following steps: backing welding, filling welding and cover surface welding;

in the backing welding, the pulse base current is 120A, the peak current is 280A, the pulse frequency is 50Hz, the flow of protective gas is 25L/min, and the welding speed is 230 mm/min;

in the filling welding and the cover surface welding, the pulse base value current is 80A, the peak current is 260A, the pulse frequency is 120Hz, the flow of protective gas is 23L/min, the wire feeding speed is 2000mm/min, and the diameter of the welding wire is 1.1 mm;

c, checking whether unwelded parts exist or not, and if so, repeating the step B to perform the welding aiming at the welding until all parts to be welded are completely welded;

wherein the welding station comprises:

the surface of the base platform is provided with a plurality of mounting holes which are distributed at intervals;

the two limiting plates are detachably mounted on the base station through any two mounting holes respectively, and limit and fix two ends of the carbon steel thick-wall pipeline to be welded respectively; the limiting plate is provided with a plurality of limiting grooves; one ends of all the limiting grooves are intersected at the same point;

the limiting rod is detachably mounted in the limiting groove, the limiting rod can move along the length direction of the limiting groove, the limiting rod is moved to a preset position and is locked and limited by the aid of nuts, and accordingly the limiting rod is fixed on the limiting plate and is locked and limited, and the limiting rod is fixed on the limiting plate and is clamped and locked at one end of the carbon steel thick-wall pipeline.

According to a preferred embodiment of the invention, the construction method for the all-position welding of the large-caliber carbon steel thick-wall pipeline comprises the step of carrying out the all-position welding construction on the large-caliber carbon steel thick-wall pipeline, wherein the alkylbenzene sulfonate solution comprises 20-30 mass percent of alkylbenzene sulfonate and the balance of water.

According to a preferred embodiment of the invention, the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline comprises the following steps:

the pair of inner rings are formed by splicing a plurality of arc-shaped pieces end to end, and every two adjacent arc-shaped pieces are connected through an elastic rubber strip; the inner ring is sleeved outside the carbon steel thick-wall pipeline to be welded, and the size of the inner ring can deform along with the size of the carbon steel thick-wall pipeline so as to adapt to seamless connection with the carbon steel thick-wall pipeline;

the pair of outer rings are correspondingly sleeved outside the pair of inner rings respectively, and a foldable outer transparent film is sleeved between the pair of outer rings so as to enclose the gas inside; the outer transparent film is provided with an air inlet for air to enter and an operation port for a welding gun to operate;

and a foldable side transparent film is also arranged between the corresponding inner ring and the outer ring.

According to a preferred embodiment of the invention, in the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline, a welding cover is temporarily installed outside the carbon steel thick-wall pipeline, and a part to be welded of the carbon steel thick-wall pipeline is covered in the range of the welding cover.

According to a preferred embodiment of the invention, before the step a, the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline needs to polish the part to be welded of the carbon steel thick-wall pipeline until the surface of the carbon steel thick-wall pipeline presents metallic luster.

According to a preferred embodiment of the invention, in the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline, the surface of the limiting rod is wrapped with a layer of rubber anti-skid pad.

According to a preferred embodiment of the invention, in the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline, the limiting groove penetrates through the limiting plate in the thickness direction.

The invention at least comprises the following beneficial effects:

(1) in the step A, firstly, sodium bicarbonate solution is used for primary deoiling cleaning, then anionic surfactant alkyl benzene sulfonate is used for deoiling cleaning, and plastic films are used for coating in the two steps, so that the cleaning effect is better.

(2) The invention has simple welding process, good welding effect and reduced cost; the welding process comprises backing welding, filling welding and cover surface welding which are combined and mutually supplemented, and the welding effect is better.

(3) The welding table of the invention respectively determines the positions of two limit plates according to the positions of two ends of the carbon steel thick-wall pipeline, then the two limit plates are arranged in the mounting holes at corresponding positions, and then the positions of a plurality of limit rods on the limit plates are adjusted according to the diameter of the carbon steel thick-wall pipeline (the limit rods move along the limit grooves), so that the carbon steel thick-wall pipeline is limited and fixed, and the welding table can be suitable for pipelines with different sizes and can be used for fixing and limiting pipelines with various sizes

(4) The invention protects the shielding gas in the welding process by using the welding cover, thereby not only ensuring the welding effect, but also reducing the cost, and the welding cover has adjustable size and can be suitable for carbon steel thick-wall pipelines with various sizes.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic view of the overall structure of a bonding stage in a preferred embodiment of the present invention;

FIG. 2 is a schematic view of a limiting plate in the welding station in the above embodiment;

FIG. 3 is a schematic view of the overall structure of a welding enclosure in a preferred embodiment of the invention;

FIG. 4 is a schematic view of the inner ring in the welding station according to the above embodiment of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be constructed and operated in a particular orientation and thus are not to be considered limiting.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

As shown in figures 1-4, the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline comprises the following steps:

step A, coating a layer of sodium bicarbonate solution with the mass fraction of 8% on a to-be-welded part of a carbon steel thick-wall pipeline, covering the to-be-welded part with a plastic film, keeping the coating for 0.5h, washing with flowing water, and airing;

coating a layer of alkylbenzene sulfonate solution on the to-be-welded and connected part of the carbon steel thick-wall pipeline, covering the alkylbenzene sulfonate solution with a plastic film, keeping the coating for 0.5h, washing the coating with flowing deionized water, and airing the coating;

b, placing the carbon steel thick-wall pipeline on a welding table, fixing the carbon steel thick-wall pipeline by using the welding table, and temporarily installing a welding cover outside the carbon steel thick-wall pipeline; finally, welding is carried out;

the welding process comprises the following steps: backing welding, filling welding and cover surface welding;

in the backing welding, the pulse base current is 120A, the peak current is 280A, the pulse frequency is 50Hz, the flow of protective gas is 25L/min, and the welding speed is 230 mm/min;

in the filling welding and the cover surface welding, the pulse base value current is 80A, the peak current is 260A, the pulse frequency is 120Hz, the flow of protective gas is 23L/min, the wire feeding speed is 2000mm/min, and the diameter of the welding wire is 1.1 mm;

c, checking whether unwelded parts exist or not, and if so, repeating the step B to perform the welding aiming at the welding until all parts to be welded are completely welded;

wherein the welding station comprises:

the surface of the base platform 1 is provided with a plurality of mounting holes 11 which are distributed at intervals; the two limiting plates 2 are detachably mounted on the base platform 1 through any two mounting holes 11 respectively, and limit and fix two ends of the carbon steel thick-wall pipeline to be welded respectively; the limiting plate 2 is provided with a plurality of limiting grooves 21; one ends of all the limiting grooves 21 are intersected at the same point; gag lever post 3, its demountable installation in the spacing groove 21, just gag lever post 3 can along the length direction of spacing groove 21 removes, treats gag lever post 3 removes to predetermineeing the position, and it is right to utilize the nut gag lever post 3 locks spacingly, and then it is same on the limiting plate 2 all gag lever post 3 will simultaneously including the one end card of carbon steel thick wall pipeline establishes, carries out spacing locking to it. The positions of the two limit plates 12 are respectively determined according to the positions of the two ends of the carbon steel thick-wall pipeline, the two limit plates 12 are installed in the installation holes 11 at the corresponding positions, the positions of the limit rods 3 on the limit plates 2 are adjusted according to the diameter of the carbon steel thick-wall pipeline (the limit rods 3 move along the limit grooves 21), and therefore the carbon steel thick-wall pipeline is limited and fixed, and the device can be suitable for pipelines with different sizes.

According to a preferred embodiment of the invention, the construction method for the all-position welding of the large-caliber carbon steel thick-wall pipeline comprises the step of carrying out the all-position welding construction on the large-caliber carbon steel thick-wall pipeline, wherein the alkylbenzene sulfonate solution comprises 20-30 mass percent of alkylbenzene sulfonate and the balance of water.

According to a preferred embodiment of the invention, the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline comprises the following steps: the pair of inner rings 4 are formed by splicing a plurality of arc-shaped pieces 41 end to end, and every two adjacent arc-shaped pieces 41 are connected through an elastic rubber strip 42; the inner ring 4 is sleeved outside the carbon steel thick-wall pipeline to be welded, and the size of the inner ring 4 can deform along with the size of the carbon steel thick-wall pipeline so as to adapt to seamless connection with the carbon steel thick-wall pipeline; a pair of outer rings 5 respectively and correspondingly sleeved outside the pair of inner rings 4, and a foldable outer transparent film 6 is sleeved between the pair of outer rings 5 so as to enclose the gas inside; the outer transparent film 6 is provided with an air inlet for air to enter and an operation port for a welding gun to operate; a foldable side transparent film is also arranged between the inner ring 4 and the outer ring 5 correspondingly. The invention protects the shielding gas in the welding process by using the welding cover, thereby not only ensuring the welding effect, but also reducing the cost, and the welding cover has adjustable size and can be suitable for carbon steel thick-wall pipelines with various sizes.

According to a preferred embodiment of the invention, in the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline, a welding cover is temporarily installed outside the carbon steel thick-wall pipeline, and a part to be welded of the carbon steel thick-wall pipeline is covered in the range of the welding cover.

According to a preferred embodiment of the invention, before the step a, the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline needs to polish the part to be welded of the carbon steel thick-wall pipeline until the surface of the carbon steel thick-wall pipeline presents metallic luster.

According to a preferred embodiment of the invention, in the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline, the surface of the limiting rod is wrapped with a layer of rubber anti-skid pad.

According to a preferred embodiment of the invention, in the all-position welding construction method for the large-caliber carbon steel thick-wall pipeline, the limiting groove penetrates through the limiting plate in the thickness direction.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.