Electric resistance welder and welding technology with on-line continuous weld seam heat processing

Abstract

The invention discloses an electric resistance welder with online continuous weld seam heat processing, which comprises a small welding vehicle, a cutting device, an electric resistance welder and a rolling device that are sequentially set on the small welding vehicle, wherein a preheat device is set on a position of the small welding vehicle corresponded with the front of the electric resistance welder; the preheat device is set between the cutting device and the electric resistance welder; a heat processing device is set on a position of the small welding vehicle corresponded with the back of the electric resistance welder; the invention also discloses an electric resistance welding technology with online continuous welding heat processing; the steps comprise that an online strip steel is cut and welded on a cutting station through the cutting device; after being cut and welded, the welding area of the online strip steel is preheated to rise in temperature on a preheating station through the preheat device; after being preheated, the online strip steel is welded on a welding station through the electric resistance welder; after welding is completed, heat processing and rolling are carried out to the weld seam area of the online strip steel on a preheat processing station and a rolling station respectively through the preheat processing device and the rolling device; and the welding technology with online continuous weld seam heat processing is suitable for welders.

Description

technical field [0001] The invention relates to the field of welding, in particular to a resistance welding machine with on-line continuous welding seam heat treatment and a welding process thereof. Background technique [0002] With the rapid development of my country's automobile, bridge, construction, home appliance and other industries that have a large demand for steel, steel companies have higher and higher requirements for the output and quality of high-standard and cost-effective steel. At present, most domestic iron and steel enterprises are gradually moving towards product transformation and equipment upgrading. Therefore, the welding of special steel is a major problem that we are about to face, but the use of ordinary resistance welding machines and welding processes cannot meet the welding requirements of special material steel, especially 400 series stainless steel, high-strength alloy steel and high phosphorus steel. ,specifically: [0003] 1. Since the temp...

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Problems solved by technology

Therefore, the welding of special steel is a major problem that we are about to face, but the use of ordinary resistance welding machines and welding processes cannot meet the welding requirements of special material steel, especially 400 series stainless steel, high-strength alloy steel and high phosphorus steel. ,specifically:

[0003] 1. Since the temperature during resistance welding is very high, this welding process will cause the temperature of the welding area to rise and fall suddenly, resulting in quenching of the weld seam and heat-affected zone, and the weld seam and heat-affected zone after quenching will obviously appear Irregular coarse crystals (especially 400 series stainless steel, high-strength alloy steel and high-phosphorus steel, etc.), so that the weld and heat-affected zone will break once they are stressed;

[0004] 2. Due to the large temperature difference between the welding area before welding and welding, it is easy to produce welding stress. At the same time, due to the high welding strain rate, it is easy to produce welding cracks and the escape of diffusible hydrogen in the weld metal. Hydrogen-induced cracking, and the degree of hardening of the weld and the heat-affected zone is relatively high

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