A laser melting and brazing method for extrusion molding

Abstract

The invention provides an extrusion forming laser welding brazing method. The extrusion forming laser welding brazing method comprises the steps that (1) a solder powder strip is paved in a to-be-welded position of a lower welding block in advance; (2) a first end of an upper welding block is placed in the position, close to the solder powder strip, on the lower welding block, and a 0 to 60-degree included angle space is formed between the upper welding block and the lower welding block; (3) laser beams obliquely shoot from the included angle space, and the laser beams are focused on the solder powder strip to form a strip-shaped brazing molten pool; (4) a second end of the upper welding block is pressed downwards, the strip-shaped brazing molten pool is pushed to be spread on a welding surface between the upper welding block and the lower welding block, and the upper welding block completely fits the lower welding block; and (5) solder is solidified to form a welding connector. According to the extrusion forming laser welding brazing method, the laser beams are utilized to melt solder to form the strip-shaped brazing molten pool, the liquid solder is pushed to be spread on a to-be-welded surface through extrusion, bubbles in the molten pool are released, the metallurgy reaction of a welding brazing connector is sufficient, the technological quality of the welding brazing connector is good, and the mechanical property is high.

Description

Technical field [0001] The invention belongs to the field of laser welding, and in particular relates to an extrusion molding laser melting and brazing method. Background technique [0002] In order to meet the development requirements of lightweight, high-performance, integrated structure and function, and low-cost manufacturing of modern equipment, various composite structures composed of materials with different characteristics will be more and more widely used. For example, the design and manufacture of modern automobiles and ship structures hope to adopt aluminum / steel composite structures, while the design and manufacture of modern aircraft structures hope to combine titanium alloys and aluminum alloys. In power electronics and air conditioning and refrigeration industries, replacing copper with aluminum is becoming a trend, and aluminum / copper composite structures have attracted more and more attention. There are two types of contact materials for circuit breaker contacts....

AI Technical Summary

Problems solved by technology

However, the current traditional brazing technology still has the following disadvantages: 1) The flow of liquid solder is not uniform, and the thickness of the formed brazing seam is uneven, which leads to uneven mechanical and electrical properties in different areas of the joint; 2) The solder is generally It is composed of a variety of alloys. The solder itself has high resistance, low thermal conductivity, and low melting point, and the brazing interface tends to become a weak zone; 3) Due to the incomplete metallurgical process of the solder, defects such as bubbles and inclusions are prone to appear in the solder joint

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