Method for inspecting quality of welding seams

Abstract

The invention relates to a method for inspecting the quality of welding seams. The appearance inspection quality needs to meet the design requirement, and when no regulations are specified in design, the following requirements need to be met: (1) the welding seam is good in appearance forming and is in smooth transition with a base material, and the proper width is that each edge can cover the edge of a groove by 1mm; (2) the phenomena such as cracks, incomplete fusion, air holes, slag inclusion and splattering are not allowed on the surface of the welding seam; (3) the undercutting phenomenon is not allowed on the surfaces of welding seams of pipelines with the design temperature of lower than -25 DEG C, stainless steel and alloy steel with larger harden quenching tendency; the undercutting depth of other materials is not more than 0.4mm, the continuous undercutting length is not more than 80mm, and the total length of undercutting of the two sides of the welding seam is not more than 4% of the total length of the welding seam; (4) the surface of the welding seam is not lower than the surface of the pipeline; the height of the excess weld metal is less than or equal to 1+0.1 of the width of the groove of the welding seam and is not more than 2mm; and (5) the misaligned edge of the welding joint is not more than 8% of the wall thickness and is also not more than 1mm.

Description

technical field [0001] The invention relates to a welding seam quality inspection method. Background technique [0002] The existing quality inspection methods for pressure welds have unreasonable process arrangements, numerous processes, and high requirements for operator experience, resulting in high production costs. Contents of the invention [0003] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a weld quality inspection method with reasonable process and low manufacturing cost. In order to achieve the above object, the present invention provides a method for inspecting the quality of welded seams, which includes the following steps: the weld seam should undergo appearance self-inspection and special inspection, the self-inspection rate is 100%, and the special inspection rate is implemented according to the design requirements. The quality of visual inspection shall meet the design r...

AI Technical Summary

Problems solved by technology

[0002] The existing quality inspection methods for pressure welds have unreasonable process arrangements, numerous processes, and high requirements for operator experience, resulting in high production costs