Method for judging residual stress of flash welding junction of mining round-link chain

Abstract

The invention relates to a method for judging the residual stress of a flash welding junction of a mining round-link chain. The method comprises the following steps of: a) sampling: taking a chain ring which just completes port upsetting welding, and removing burrs at a welding seam of the chain ring; b) cooling: performing air cooling on the chain ring of which the burrs are removed after weldingin a dry environment; c) cutting a seam: cutting a seam along the cross section of a to-be-measured chain ring which is cooled to room temperature, wherein the spacing distance between the cutting position and the welding seam is less than 5mm; d) measuring the seam: measuring the width of the cutting seam in the step c), and comparing the width with a theoretical cutting width directly caused bycutting equipment for cutting the seam; e) adjusting process parameters of flash welding according to the measurement result in the step d, wherein the process parameters include but are not limitedto upsetting force and / or upsetting pressure maintaining time or preheating time; and f) repeating the steps a-d until the cutting seam is close to or equal to the theoretical cutting width. Accordingto the judgment method, whether related parameters such as the upsetting force and the pressure maintaining time are in place or not can be found in time and adjusted.

Description

technical field [0001] The invention relates to a method for judging the size of the residual stress of the flash welding joint of the mining circular chain, which is used for exploration and research of the flash welding process of the mining circular chain. Background technique [0002] Mining circular link chain is the main equipment for mechanized mining in coal mines, that is, the transmission chain on scraper conveyors, scraper loaders, shearers and plows; with the upgrading of coal mining equipment, high-strength mining circular chains The demand for chains in coal mining is increasing day by day. The welding of circular link chains adopts flash butt welding. These contact points are heated by resistance heat (generating flash), so that the metal on the end face melts, and when the end reaches a predetermined temperature within a certain depth range, an upsetting force is quickly applied to allow the two ends to contact to complete welding. [0003] The function of t...

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Problems solved by technology

[0005] At present, the design of the flash welding welding process for mining circular chain steel at home and abroad mainly relies on experience to explore, and there is no scientific and accurate method to support the adjustment of the welding process window, especially for new steel types and new specifications mining circular chains The welding process parameters of the steel, the residual stress of the welding operation (that is, the size of the amplitude) play a crucial role in the quality of the flash welding joint, and the factors that control the size of the amplitude include: upsetting speed, upsetting force, retention If the control is not proper, a lot of manpower, financial resources and material resources will be wasted, the construction period will be delayed, a large number of defective products will be caused, and the welding quality problem will be prominent.

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