Method for leading out transverse weld seam of small and medium thickness high strength steel T-shaped butt joint structural parts

Abstract

The invention provides a horizontal welding joint extracting method of a moderate and small thickness high-strength steel T type butt joint structure part. The horizontal welding joint extracting method of the moderate and small thickness high-strength steel T type butt joint structure part adopts the following specific steps that 1, a welding joint is led in from a welding joint leading-in end, welding is adopted at the horizontal welding joint more than 300 mm away from an angle root part, the welding is changed to modification welding at the position 300 mm away from the angle root part, and when the welding joint direction reaches the angle root part, the welding direction is reversed; 2, after the welding direction is reversed, welding is adopted at the horizontal welding joint less than 300 mm away from the angle root part; the modification welding is changed to the welding at the position 300 mm away from the angle root part; 3, finally, a leading-in plate is used for leading in the welding joint from the original welding joint leading-in end, and the welding work of the horizontal welding joint of the high-strength steel T type butt joint structure part is completed. The horizontal welding joint extracting method is suitable for all high-strength steel T type butt joint structure parts, on one hand, the problem that T type horizontal welding joint can not be led in is effectively solved, on the other hand, the problem that the angle root part of the T type horizontal welding joint is prone to generating defects is effectively solved, and the welding quality is guaranteed.

Description

technical field [0001] The invention relates to a method for drawing out transverse weld seams of T-shaped butt joint structural parts of high-strength steel with small and medium thickness, and belongs to the technical field of electron beam welding. Background technique [0002] At present, in order to meet different performance requirements, the structure of parts is becoming more and more diverse, and the control of size is becoming more and more precise. It is usually impossible to achieve by means of machining, so vacuum electron beam welding with small deformation is required. [0003] However, due to vacuum electron beam welding, the weld shape is narrow, and the bottom is often accompanied by a slender "top", such as a typical T-shaped butt joint structural part, at the root of the corner (the intersection of the horizontal weld and the vertical weld) due to the welding Seam end positions and weld intersections, so there are often spurious defects that cannot be ide...

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Problems solved by technology

[0002] At present, in order to meet different performance requirements, the structure of parts is becoming more and more diverse, and the control of size is becoming more and more precise, which is usually impossible to achieve by means of machining, so vacuum electron beam welding with small deformation is required.

[0003] However, due to vacuum electron beam welding, the weld shape is narrow, and the bottom is often accompanied by a slender "top", such as a typical T-shaped butt joint structural part, at the root of the corner (the intersection of the horizontal weld and the vertical weld) due to the welding seam ends and weld intersections, so there are often spurious defects that cannot be identified by X-ray

In addition, since the T-shaped butt joint structural parts cannot lead to the electron beam welding transverse weld at the root of the corner, the ending part of the weld is usually left at the corner root of the part, which will cause defects such as pores and cracks to appear at the root of the corner that is not well formed.

In order to make up for this defect, those skilled in the art usually adopt the method of repair welding, that is, manual repair welding or adopting general electron beam method repair welding, but these two repair welding methods all have deficiencies, as follows: 1. Adopt manual repair welding The method cannot be protected in the atmosphere, and the deformation is large; 2. Using the general electron beam method to repair welding is difficult to eliminate locally, and the pores are easily scattered at the root of the corner of the part and cannot be eliminated

In addition, due to the high grade requirements of the weld seam, the number of repair welding is strictly limited, so the repair welding is more likely to lead to the scrapping of parts, which seriously affects the welding production

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