Welding method of thin silver plate

Abstract

The invention discloses a thin silver plate welding method, which comprises the following steps of: 1, cleaning burrs at the edge part of a thin silver plate, and then cleaning the surface to obtain a treated thin silver plate; secondly, base metal within the range of 100 mm on the two sides of a target welding seam of the treated thin silver plate is preheated, and the preheated thin silver plate is obtained; and thirdly, the preheated thin silver plate is welded through a motorized direct-current pulse argon tungsten-arc welding machine, and the welded thin silver plate is obtained. After the thin silver plate is cleaned and cleaned, the thin silver plate is preheated and then subjected to engine-driven direct-current pulse argon tungsten-arc welding, welding forming is achieved by controlling the preheating temperature, the interlayer temperature in the welding process, the welding current, the welding voltage and other technological parameters, welding defects such as cracks and air holes are reduced, the welding seam performance and the welding stability are guaranteed, and the welding quality is improved. The welding quality is improved, large-specification thin silver plate welding is achieved, and meanwhile the welding cost and the welding labor intensity are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a welding method for a thin silver plate. Background technique [0002] During the welding process of silver plates, due to its large linear expansion coefficient and high thermal conductivity, high heat input is required during welding, and it is easy to cause large welding stress and deformation. At the same time, oxygen has a large solubility in liquid silver. After welding, due to the rapid cooling of silver, the solubility of oxygen in silver decreases rapidly, and it cannot overflow in time, and it is easy to form pores. For thin silver plate welding, these problems are more prominent due to the reduction of plate thickness, which makes welding more difficult and the quality of welds is greatly reduced. [0003] The existing thin silver plate welding process has the following two types: (1) gas welding: gas welding silver plate, mainly using oxyacety...

AI Technical Summary

Problems solved by technology

However, the strength of welded joints is unstable, the quality of welds is relatively poor, and defects such as pores are prone to occur, which cannot meet the requirements of non-destructive testing such as ray

This method can effectively weld smaller plate widths, but it is difficult to carry out large-scale welding, long-term welding, and high welding costs; (2) brazing: silver-based solder is used, the strength of welded joints is unstable, and many lap joints are welded. Weld quality is relatively poor

This method can effectively weld smaller plate widths, but it is difficult to use for large plate widths, long-term operation and processing, and the strength of the brazed joint is low, and the welding cost is high