Resistance welding machine with online continuous weld heat treatment

Abstract

The invention discloses a resistance welding machine with online continuous weld heat treatment, including a welding carriage, a shearing device, a resistance welding device and a rolling device. The welding carriage is provided with a preheating device and a heat treatment device. The next step after the process of welding is a brittle processing procedure, and the position of the brittle processing procedure is provided with a brittle processing device. The brittle processing device includes an auxiliary trolley, and a water tank, an annealing mechanism and a circulating water cooler, and they are arranged on the auxiliary trolley in order. A rapid cooling nozzle which can quickly cool down the both sides of the welding area of the online strip steel is arranged in the water tank and on the upper portion of the water tank which the auxiliary trolley corresponds to. The rapid cooling nozzle is connected with the outlet of the circulating water cooler. The heat treatment device includes a normalizing mechanism and a tempering mechanism. The normalizing mechanism is provided between the resistance welding device and the rolling device, and the tempering mechanism is provided behind the rolling device. The resistance welding machine with online continuous weld heat treatment is suitable for welding machine.

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. 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 cannot meet the welding requirements of special material steel, especially 400 series stainless steel, high-strength alloy steel and high phosphorus steel. : [0003] 1. Since the temperature during resistance welding is very high, this welding proc...

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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 cannot meet the welding requirements of special material steel, especially 400 series stainless steel, high-strength alloy steel and high phosphorus steel. :

[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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