Method for determining welding shrinkage of H-type longitudinal beam

Abstract

The invention discloses a method for determining the welding shrinkage of an H-type longitudinal beam. The method comprises the steps that the length, cross section area, weld area and welding shrinkage of a preset number of welded H-type longitudinal beams are counted; based on a shrinkage calculation formula, the welding shrinkage coefficient of each welded H-type longitudinal beam is calculated; averaging operation is conducted on the welding shrinkage coefficients of the preset number of welded H-type longitudinal beams, and a first welding shrinkage coefficient is obtained; the length, cross section area and weld area of an H-type longitudinal beam to be machined are determined, the first welding shrinkage coefficient is used as the welding shrinkage coefficient of the H-type longitudinal beam to be machined, and the welding shrinkage of the H-type longitudinal beam to be machined is calculated out based on the shrinkage calculation formula. By means of the method, the welding shrinkage of the H-type longitudinal beam can be precisely determined, so that the blanking length of a corresponding part is determined, and it is unnecessary to conduct cutting machining after weldingto enable the length of the longitudinal beam to meet a design requirement.

Description

technical field [0001] The invention relates to the technical field of welding of H-shaped longitudinal beams, in particular to a method for determining the welding shrinkage of H-shaped longitudinal beams. Background technique [0002] The longitudinal beams of the chassis frame of oilfield special vehicles are H-shaped welded structures, and most of the longitudinal beams are added with 4000-10000mm reinforcing plates in the same direction as the webs to improve local strength. Due to the shrinkage of welding, in order to ensure the design length after welding, a 50mm machining allowance was initially reserved for cutting after welding. This method not only wastes materials and man-hours, but also has the problem that the web body at the junction of the wing plate and the web may be cut due to the on-site cutting, and there is a quality risk. The empirical method to determine the reserved amount also has the same problem that the length of the longitudinal beam after weld...

AI Technical Summary

Problems solved by technology

This method not only wastes materials and man-hours, but at the same time, due to the on-site cutting, there is a problem that the web body at the junction of the flange and the web may be cut, and there are quality risks

The empirical method to determine the reserved amount also has the same problem that the length of the longitudinal beam after welding cannot be accurately controlled after the structure of the longitudinal beam changes, and on-site cutting is still required, which cannot completely solve this problem

Images