CN-116511647-B - Narrow-gap arc welding process and equipment for thick plate circumferential seams

CN116511647BCN 116511647 BCN116511647 BCN 116511647BCN-116511647-B

Abstract

The invention innovatively provides a narrow-gap arc welding process of thick plate circular seams, which comprises the steps of butting two groups of cylinders to be welded to form a narrow-gap welding seam, wherein the narrow-gap welding seam is in an annular state, a coordinate system is established by taking the circle center of the cylinders to be welded as an origin, the normal line of the cylinders is taken as the Z axis direction, the X axis is taken as the horizontal direction, and the Y axis is taken as the vertical direction, a metal backing plate is arranged in the narrow-gap welding seam, the metal backing plate forms a 45-degree angle with the normal line direction of the cylinders to be welded, a triangular area is enclosed between the metal backing plate and the cylinders to be welded, a welding gun moves in the X axis and the Y axis directions to completely fill the triangular area, initial welding seam filling is completed, a welding pool plane is parallel to the X axis, the welding gun moves in the X axis direction, meanwhile, a roller frame drives the cylinders to roll, the welding pool plane is always parallel to the X axis, the welding pool plane to the metal backing plate intersects with the welding pool plane of a welding end point and is vertical, and the welding gun moves in the X axis direction, and meanwhile the welding gun is lifted in the Y axis direction.

Inventors

ZHANG JUN
XU BING
ZHANG ZHUANTAO
GENG ZHENG
HUANG BAOXIAN
ZHANG YIQIN
Zeng Zhikun
ZHANG HAIYANG
JIANG YONG

Assignees

华路德(浙江)焊接科技有限公司

Dates

Publication Date: 20260512
Application Date: 20230517

Claims (3)

1. A narrow gap arc welding process for thick plate circular seams is characterized by comprising the following steps: Firstly, two groups of cylinders to be welded are butted to form a narrow-gap welding seam, wherein the narrow-gap welding seam is in an annular state, a coordinate system is established by taking the circle center of the cylinders to be welded as an origin, the normal line of the cylinders is taken as the Z-axis direction, the X-axis is taken as the horizontal direction, and the Y-axis is taken as the vertical direction; Arranging a metal backing plate in the narrow-gap welding seam, wherein the metal backing plate forms a 45-degree angle with the normal direction of the cylinder to be welded, and a triangular area is formed between the metal backing plate and the cylinder to be welded; Thirdly, the welding gun (2) moves in the directions of the X axis and the Y axis, the triangular area is completely filled, initial weld filling is completed, and the plane of a welding pool is parallel to the X axis; Step four, the welding gun (2) moves along the X-axis direction, and meanwhile, the roller frame (3) drives the cylinder to be welded to roll, the plane of a welding pool is always parallel to the X-axis, and the plane of the welding pool which is the metal backing plate and the welding end point is intersected and vertical; step five, the welding gun (2) moves along the X-axis direction, and meanwhile the welding gun (2) is lifted along the Y-axis direction, wherein the movement path of the welding gun (2) in the X-axis direction in the step five is a metal backing plate to the surface of a cylinder to be welded, and the workpiece to be machined in the step five stops rotating.
2. The narrow gap arc welding process of thick plate circumferential seam according to claim 1, wherein one end of the metal backing plate in the second step is aligned with the bottom of the narrow gap weld, and the other end of the metal backing plate is aligned with the surface of the cylinder to be welded.
3. The narrow gap arc welding process of thick plate circular seam according to claim 1, wherein in the fourth step, the roller frame (3) drives the rotation speed of a workpiece to be processed to be matched with the welding current, so that automatic tracking in the arc height direction is realized.

Description

Narrow-gap arc welding process and equipment for thick plate circumferential seams Technical Field The invention relates to the technical field of welding, in particular to a narrow-gap arc welding process and equipment for thick plate girth. Background The method is widely known to be an efficient arc welding method for thick plate welding, has the same defects in the narrow gap welding of the thick-wall container, is generally 10-20mm in width, requires a complex welding gun structure and has high dimensional precision requirements on a workpiece groove, and therefore, the narrow gap welding method can only be used for welding special products with leather openings subjected to precise machining, such as welding of thick-wall high-pressure containers, and has a large number of thick-wall cylindrical products in the fields of steel structures, engineering machinery and other fields with high welding workload requirements. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a narrow-gap arc welding process and equipment for thick plate circular seams, which are used for overcoming the defects in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: A narrow gap arc welding process for thick plate circular seams is characterized by comprising the following steps: Firstly, two groups of cylinders to be welded are butted to form a narrow-gap welding seam, wherein the narrow-gap welding seam is in an annular state, a coordinate system is established by taking the circle center of the cylinders to be welded as an origin, the normal line of the cylinders is taken as the Z-axis direction, the X-axis is taken as the horizontal direction, and the Y-axis is taken as the vertical direction; Arranging a metal backing plate in the narrow-gap welding seam, wherein the metal backing plate forms a 45-degree angle with the normal direction of the cylinder to be welded, and a triangular area is formed between the metal backing plate and the cylinder to be welded; thirdly, the welding gun moves in the X-axis and Y-axis directions, the triangular area is completely filled, initial weld filling is completed, and the plane of a welding pool is parallel to the X-axis; Step four, the welding gun moves along the X-axis direction, and meanwhile, the roller frame drives the cylinder to be welded to roll, the plane of the welding pool is always parallel to the X-axis, and the plane of the welding pool is intersected with and vertical to the plane of the welding pool at the welding end point of the metal backing plate; And fifthly, the welding gun moves along the X-axis direction, and meanwhile, the welding gun is lifted along the Y-axis direction. Preferably, one end of the metal backing plate in the second step is aligned with the bottom of the narrow-gap weld, and the other end of the metal backing plate is aligned with the surface of the cylinder to be welded. Preferably, in the fourth step, the roller frame drives the rotating speed of the workpiece to be processed to be matched with the welding current, so that automatic tracking in the arc height direction is realized. Preferably, in the fifth step, the movement path of the welding gun in the X-axis direction is from the metal backing plate to the surface of the cylinder to be welded. Preferably, in the fifth step, the workpiece to be machined stops rotating. Preferably, the welding gun comprises a support and a welding gun, wherein two groups of roller frames are arranged on the support, the two groups of roller frames are oppositely arranged on two sides of the welding gun, each group of roller frames are provided with roller pairs, supporting grooves for placing workpieces to be machined are arranged between the roller pairs, and the supporting grooves on the two groups of roller frames are positioned on the same straight line. Preferably, the roller pair comprises a first roller and a second roller, hinge shafts are arranged at the bottoms of the first roller and the second roller, a first air cylinder is arranged between the hinge shafts, the first air cylinder drives the two hinge shafts to move so that the first roller and the second roller are close to or far away from each other, a supporting plate is arranged at the bottom of the roller pair, a second air cylinder is arranged at the bottom of the supporting plate, the second air cylinder drives the supporting plate to move up and down, a sliding groove is formed in the rack, and the supporting plate and the hinge shafts are slidably arranged in the sliding groove. Preferably, the sliding grooves comprise a first sliding groove, a second sliding groove and a third sliding groove, sliding blocks are respectively arranged in the first sliding groove and the second sliding groove, two groups of hinge shafts are respectively hinged to the two groups of sliding blocks, the supporting plate is arranged in the t