Welding and polishing process for three-side intersection position

Abstract

The invention discloses a welding and polishing process for a three-side intersection position. The process comprises the following steps that S1, weld joints at the three-side intersection position are polished by using a grinding wheel; and S2, a grinding whetstone is used for polishing the weld joints at the three-side intersection position, in a grinding process, an axial direction of a rotating shaft of the grinding whetstone is perpendicular to the weld joints, and the grinding whetstone is operated to rotate in one direction along an O-shaped track, wherein in S1, the weld joints at thethree-side intersection position comprise weld joints in the length direction and a weld joint at the intersection position, and in S2, the weld joints at the three-side intersection position comprise the weld joints in the length direction and the weld joint at the intersection position. According to the welding and polishing process for the three-side intersection position, by standardizing a polishing process and a procedure, a problem of polishing of weld joint defects of the three-side intersection position of a welded part is solved, meanwhile, damage to base metal caused by repeated polishing of the same position and the low working efficiency are avoided, the situation of repeated repair welding caused by MT defects due to flaw detection is reduced, and the product quality is improved.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding and grinding process at the intersection position of three sides. Background technique [0002] With the rapid development of my country's rail transit, how to control the production quality under the premise of ensuring production efficiency has become the most important issue. At present, there is a serious production bottleneck in the manufacture of the underframe at the end of the car body, that is, there are many complex intersection structures inside the car body bolster, and there are many welds at the three-side intersection positions of the side beams and cross beams on the welding frame of the EMU. Seam, where the space is narrow, there are too many weld layers, the grinding is difficult, and the amount of weld repair is large, which will cause the following quality risks: [0003] 1. The space is narrow, welding and repairing is difficult, and t...

AI Technical Summary

Problems solved by technology

At present, there is a serious production bottleneck in the manufacture of the underframe at the end of the car body, that is, there are many complex intersection structures inside the car body bolster, and there are many welds at the three-side intersection positions of the side beams and cross beams on the welding frame of the EMU. Seam, where the space is narrow, there are too many weld layers, the grinding is difficult, and the amount of weld repair is large, which will cause the following quality risks:

[0003] 1. The space is narrow, welding and repairing is difficult, and there is a risk of welding and repairing failure, which will cause parts to be scrapped;

[0004] 2. Manual repair welding is required, which is difficult to repair, consumes a lot of materials, and requires flaw detection for inspection, resulting in excessive economic losses;

[0005] 3. Repair welding will cause heat concentration and cause welding deformation of each seat, which requires repeated repairs

[0009] Therefore, it is necessary to improve the deficiencies and defects of the existing technology, provide a welding and grinding process at the intersection position of three sides, standardize the grinding process, avoid weld defects caused by repeated grinding, and avoid the defects caused by repeated grinding at the same position. Damage to the base metal and low work efficiency reduce repeated welding repairs caused by MT defects in flaw detection and improve product quality

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