阅读说明：本技术 一种大管径不锈钢双侧同步焊接工艺 (Large-pipe-diameter stainless steel double-side synchronous welding process ) 是由 周开辉 张晓伟 杨渊萍 周斌 马振 张育忠 于 2021-06-16 设计创作，主要内容包括：本发明公开了一种大管径不锈钢双侧同步焊接工艺,涉及到焊接制造技术领域,包括以下操作步骤：S1、焊枪准备及位置调整,即为准备两把焊枪,分别为第一焊枪和第二焊枪,第一焊枪位于不锈钢焊缝的正面,第二焊枪位于不锈钢焊缝的背面；S2、同步焊接,即为第一焊枪对不锈钢焊缝的正面进行打底焊接,第二焊枪对不锈钢焊缝的背面进行二次熔合,且第二焊枪与不锈钢焊缝的背面之间的距离需保持不变；S3、同步焊接完成后,进行不锈钢焊缝背面的质量检测。本发明中采用大管径不锈钢双侧同步焊接工艺,无需制作氩气室工装,省去了焊接前后氩气室工装的安装和拆除工作,不用焊前大量的准备工作,大大提高焊工的机动性能,简化了焊接施工工序。(The invention discloses a large-pipe-diameter stainless steel double-side synchronous welding process, which relates to the technical field of welding manufacture and comprises the following operation steps: s1, preparing welding guns and adjusting positions, namely preparing two welding guns, namely a first welding gun and a second welding gun, wherein the first welding gun is positioned on the front side of the stainless steel welding seam, and the second welding gun is positioned on the back side of the stainless steel welding seam; s2, synchronous welding, namely, backing welding is carried out on the front side of the stainless steel welding seam by a first welding gun, secondary fusion is carried out on the back side of the stainless steel welding seam by a second welding gun, and the distance between the second welding gun and the back side of the stainless steel welding seam needs to be kept unchanged; and S3, after the synchronous welding is finished, carrying out quality detection on the back of the stainless steel welding seam. According to the invention, the large-pipe-diameter stainless steel bilateral synchronous welding process is adopted, an argon chamber tool is not required to be manufactured, the mounting and dismounting work of the argon chamber tool before and after welding is saved, a large amount of preparation work before welding is not required, the maneuverability of a welder is greatly improved, and the welding construction process is simplified.)

1. The large-pipe-diameter stainless steel double-side synchronous welding process is characterized by comprising the following operation steps of:

s1, preparing welding guns and adjusting positions, namely preparing two welding guns, namely a first welding gun and a second welding gun, wherein the first welding gun is positioned on the front side of the stainless steel welding seam, and the second welding gun is positioned on the back side of the stainless steel welding seam;

s2, synchronous welding, namely, backing welding is carried out on the front side of the stainless steel welding seam by the first welding gun, secondary fusion is carried out on the back side of the stainless steel welding seam by the second welding gun, and the distance between the second welding gun and the back side of the stainless steel welding seam needs to be kept unchanged;

and S3, after the synchronous welding is finished, carrying out quality detection on the back of the stainless steel welding seam.

2. The double-sided synchronous welding process of large-diameter stainless steel according to claim 1, wherein the first welding torch and the second welding torch are staggered from each other in S1.

3. The double-sided synchronous welding process of large-diameter stainless steel according to claim 1, wherein in S2, a metal is filled in the stainless steel weld before the first welding gun performs the front welding of the stainless steel weld.

4. The double-sided synchronous welding process of large-diameter stainless steel according to claim 3, wherein the second welding gun is stopped when the thickness of the backing weld metal exceeds 5mm at S2.

5. The double-sided synchronous welding process of large-diameter stainless steel according to claim 4, wherein in S2, when the second welding gun stops working, the first welding gun continues working until the welding of the stainless steel weld joint is completed.

Technical Field

The invention relates to the technical field of welding manufacturing, in particular to a double-side synchronous welding process for large-diameter stainless steel.

Background

Aiming at the welding of large-diameter stainless steel, the current welding process is as follows:

1. the welding method is a single-side welding and double-side forming process of argon tungsten-arc welding bottoming and manual electric arc welding filling cover surface.

2. The groove form is V type groove, and the both sides of weldment connection face are all polished and are opened 30 ~ 35 groove, and the groove truncated edge is 2 mm.

3. The back of the argon tungsten-arc welding back cover and the filling welding of the sublayer are filled with inert protective gas, in order to save argon gas and improve the protection effect when the back is protected by the inert protective gas, argon gas chamber tools of various specifications are required to be manufactured according to pipeline specifications, an argon gas chamber is required to be installed before welding, and the argon gas chamber is required to be removed in time after welding so as to avoid causing foreign matters.

However, the existing single-sided and double-sided forming process has difficulty in filling argon due to large pipe diameter and large consumption of argon, and the time and cost for manufacturing a special argon chamber are high.

Disclosure of Invention

The invention aims to provide a double-side synchronous welding process for large-diameter stainless steel, which is used for solving the technical problem.

The technical scheme adopted by the invention is as follows:

a large-pipe-diameter stainless steel double-side synchronous welding process comprises the following operation steps:

s1, preparing welding guns and adjusting positions, namely preparing two welding guns, namely a first welding gun and a second welding gun, wherein the first welding gun is positioned on the front side of the stainless steel welding seam, and the second welding gun is positioned on the back side of the stainless steel welding seam;

s2, synchronous welding, namely, backing welding is carried out on the front side of the stainless steel welding seam by the first welding gun, secondary fusion is carried out on the back side of the stainless steel welding seam by the second welding gun, and the distance between the second welding gun and the back side of the stainless steel welding seam needs to be kept unchanged;

and S3, after the synchronous welding is finished, carrying out quality detection on the back of the stainless steel welding seam.

Preferably, in S1, the first welding torch and the second welding torch are offset from each other.

Preferably, in S2, before the first welding gun performs the front welding of the stainless steel bead, the stainless steel bead needs to be filled with a metal.

Further preferably, in S2, when the thickness of the backing weld metal exceeds 5mm, the second welding gun stops operating.

As a further preferred feature, in S2, when the second welding gun stops operating, the first welding gun continues to operate until the welding of the stainless steel weld is completed.

The technical scheme has the following advantages or beneficial effects:

according to the invention, the large-pipe-diameter stainless steel bilateral synchronous welding process is adopted, an argon chamber tool is not required to be manufactured, the mounting and dismounting work of the argon chamber tool before and after welding is saved, a large amount of preparation work before welding is not required, the maneuverability of a welder is greatly improved, and the welding construction process is simplified; the back of the welding seam is provided with an inner welding seam to assist welding personnel to take charge of argon filling and secondary fusion of the back of the welding seam, so that the back of the welding seam can be more effectively protected and the backing quality can be controlled; the argon gas for protecting the back of the welding line can be fully utilized, the argon gas is saved, the problem of argon arc protection of the back of the large-diameter stainless steel single-side welding is solved, the quality of the stainless steel backing welding line is improved, and the construction cost is saved.

Drawings

FIG. 1 is a schematic front view of the double-side synchronous welding of large-diameter stainless steel according to the present invention;

FIG. 2 is a top view of the double-side synchronous welding of large-diameter stainless steel according to the present invention.

In the figure: 1. a first welding gun; 2. a second welding gun; 3. stainless steel; 4. stainless steel welds.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, their indicated orientations or positional relationships are based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

FIG. 1 is a schematic front view of the double-side synchronous welding of large-diameter stainless steel according to the present invention; fig. 2 is a top view of the large-diameter stainless steel double-side synchronous welding process of the present invention, please refer to fig. 1 to 2, which illustrate a preferred embodiment, and the present invention provides a large-diameter stainless steel double-side synchronous welding process, including the following steps:

and S1, preparing welding guns and adjusting positions, namely preparing two welding guns, namely a first welding gun 1 and a second welding gun 2, wherein the first welding gun 1 is positioned on the front side of the stainless steel welding seam 4, and the second welding gun 2 is positioned on the back side of the stainless steel welding seam 4. In this embodiment, the first welding gun 1 is held by the welding-seam front welding person, the second welding gun 2 is held by the welding-seam back auxiliary welding person, and the welding-seam front welding person and the welding-seam back auxiliary welding person are staggered by a certain distance. In the present embodiment, the first welding gun 1 and the second welding gun 2 are both argon arc welding guns. The first welding torch 1 and the second welding torch 2 in the present embodiment may be fixed by a robot hand. The stainless steel weld 4 in this embodiment is a weld on the stainless steel 3 with a large pipe diameter, which can be specifically seen in fig. 1.

And S2, synchronous welding, namely, backing welding is carried out on the front side of the stainless steel welding seam 4 by the first welding gun 1, secondary fusion is carried out on the back side of the stainless steel welding seam 4 by the second welding gun 2, and the distance between the second welding gun 2 and the back side of the stainless steel welding seam 4 needs to be kept unchanged. In this embodiment, when the welding seam front welder performs backing welding, the welding seam back welder assists the welder to perform secondary fusion at the back, and in the process of performing secondary fusion, the back welder needs to keep the distance between the second welding gun 2 and the stainless steel welding seam 4 unchanged (the distance can be within a certain error range).

And S3, after the synchronous welding is finished, carrying out quality detection on the back of the stainless steel welding seam 4. In this embodiment, when the quality of the back surface of the stainless steel weld 4 is not satisfactory, step S2 needs to be repeated. In the embodiment, the large-pipe-diameter stainless steel bilateral synchronous welding process is adopted, an argon chamber tool is not required to be manufactured, the mounting and dismounting work of the argon chamber tool before and after welding is omitted, a large amount of preparation work before welding is not required, the maneuverability of a welder is greatly improved, and the welding construction process is simplified; the auxiliary welding personnel in the welding line is responsible for argon filling and secondary fusion of the back of the welding line, so that the back of the welding line can be more effectively protected and the priming quality can be controlled; the argon gas for protecting the back of the welding line can be fully utilized, and the argon gas is saved. Solves the problem of back argon arc protection of the stainless steel 3 with large pipe diameter by single-side welding, improves the quality of backing weld joints of the stainless steel 3 and saves the construction cost

Further, as a preferred embodiment, in S1, the first welding torch 1 and the second welding torch 2 are staggered from each other, and during the welding process, the welding is performed simultaneously in tandem, so that the welding accuracy can be improved.

Further, as a preferred embodiment, in S2, before the first welding gun 1 performs the front welding of the stainless steel bead 4, it is necessary to fill the stainless steel bead 4 with metal. Wherein, weld joint front welding personnel carry out the welding joint filler metal as main welding personnel, guarantee the filling of welding joint cladding metal and the shaping of front welding seam.

Further, as a preferred embodiment, in S2, when the thickness of the backing weld metal exceeds 5mm, the second welding gun 2 stops operating.

Further, as a preferred embodiment, in S2, when the second welding gun 2 stops working, the first welding gun 1 continues working until the welding of the stainless steel weld 4 is completed. In this embodiment, when the thickness of the backing weld metal exceeds 5mm, the welding work of the welding staff is assisted to the back of the weld, and the welding work of the welding staff on the front of the weld is finished.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.