Welding process for red copper and stainless steel dissimilar materials

Abstract

The invention discloses a welding process for red copper and stainless steel dissimilar materials. The welding process comprises the following steps of: (A) machining grooves on the opposite sides of a red copper component and a stainless steel component, cleaning foreign matters on the edges of the grooves, placing the red copper component and the stainless steel component on the same plane for pairing, and reserving a gap; (B) performing before-welding preheating on one side of the red copper component at 600 to 680 DEG C; (C) tackingperforming point fixing in a plurality of positions between the red copper component and the stainless steel component according to a tacking sequence; (D) welding the red copper component and the stainless steel component by adopting shielded metal arc welding direct current electrode positive; (E) heating a welding joint to 130 to 180 DEG C after the red copper component and the stainless steel component are welded, cooling the welding joint to room temperature, and performing dehydrogenation treatment to reduce hydrogen content in a welding seam; and (F) after the dehydrogenation treatment and cooling, performing stabilization treatment on one side of the stainless steel component at 840 to 890 DEG C, and quickly cooling the stainless steel component to reduce the formation of chromium carbide and improve the plasticity and toughness of the welding seam.

Description

technical field [0001] The invention relates to a welding process, in particular to a welding process for red copper and stainless steel dissimilar materials to obtain high-quality welds and reduce welding costs. The welding process is to preheat the red copper, Electrode arc welding is adopted, nickel-based electrodes are selected, and a number of processes such as reasonable preheating, strip transport, hydrogen elimination, and stabilization treatment are carried out. Background technique [0002] In the welding process of red copper and stainless steel dissimilar materials, due to the huge gap between the chemical composition, thermal conductivity, melting point and various mechanical properties of the two, the welding difficulty is much greater than that of similar materials. [0003] The existing copper and stainless steel dissimilar material welding process has the following two kinds: [0004] 1. Oxygen-acetylene flame brazing [0005] When red copper and stainless...

AI Technical Summary

Problems solved by technology

[0007] When argon tungsten arc welding is used to weld red copper and stainless steel dissimilar materials, the influence of the difference in thermal conductivity between the two can be overcome by preheating, but the equipment is complicated, and general maintenance units and individuals rarely have similar equipment, so Difficult to achieve during maintenance

And the filling material is usually silver-copper-zinc welding wire, which is expensive (about 2,000 yuan / Kg). If welding Φ57×4.5mm red copper and stainless steel dissimilar material joints, about 0.5Kg welding wire is needed, a total of 1,000 yuan, not including the cost of argon ; Furthermore, the requirements for the welding environment are very high, only in the indoor environment, otherwise there will be a large number of defects such as pores

Images