Characterization method for size stability after welding forming

Abstract

The invention discloses a characterization method for size stability after welding forming. The characterization method includes the following steps that firstly, a large circular-ring-shaped weldingpart and a small circular-ring-shaped welding part are manufactured, wherein the inner diameter of the large welding part is equal to the outer diameter of the small welding part; secondly, the smallwelding part is sleeved with the large welding part, the large welding part and the small welding part are integrally welded through the welding technology, and therefore a welding forming sample is formed; thirdly, an opening is formed in the radius direction of the welding forming sample and is perpendicular to the surface of the welding forming sample; and fourthly, the linear distance parameter between opposite two points of the circumference of the boundary line of the upper surfaces of the two sides of the opening is detected in a fixed time interval, and the deflection change parametersof the welding forming sample is detected. By means of the characterization method, the size stability condition of the welding parts along time after welding forming can be detected rapidly, accurately and conveniently.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a characterization method for dimensional stability after welding. Background technique [0002] As an important part of advanced manufacturing technology, welding plays a decisive role in industrial production and social development. Welding has a wide range of applications in many industrial structures. For example, transportation tracks, pressure vessels, ships, aerospace, etc. Steel for welded structures accounts for 50-60% of the world's steel mills. [0003] However, in some precision manufacturing fields, high dimensional accuracy is required after welding and good dimensional stability is required after welding. It has a significant impact on the overall accuracy of the machine tool. [0004] Due to the process of concentrated heat input and post-weld cooling; the thermal expansion and contraction of the weld metal is restrained by the cold metal around the weld and ...

AI Technical Summary

Problems solved by technology

In practice, residual stress relaxation still occurs leading to dimensional changes in welded structures

thereby affecting product performance

[0005] Usually, because the dimensional change caused by stress relaxation is not obvious enough, the common method of measuring the dimensional change before and after welding of rod or plate samples is prone to large errors, and the time period is long, which is not conducive to characterizing the welded structural parts. Dimensional stability

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