Laser path and laser welding method of a laser welding point

Abstract

The invention discloses a laser path of a laser welding point, and a laser welding method. The laser welding method comprises the steps of fixing a product to be welded onto a two-dimensional platformthrough a fixture, utilizing a pulse laser for scanning welding a welding point in a welding area of the product to be welded, and dividing a laser scanned path graph of the welding point into threesegments, wherein the first segment is a straight-line segment or a curved segment, the second segment is formed by multiple reciprocating disjoint straight-line segments or curved segments, startingpoints of each two adjacent straight-line segments or curved segments are connected through a transition segment, the third segment is a straight-line segment or a curved segment, and the first segment, the second segment and the third segment are sequentially connected; and crossing the straight-line segments or the curved segments of the first segment and the second segment, crossing the straight-line segments or the curved segments of the third segment and the second segment, and during a laser scanning welding process, blowing a protection gas to the welding point. According to a speciallyedited point-shaped welding graph, a thin slice is welded through a single-pulse superposition track manner, multiple small molten pools are formed in the thin slice material, and the welding point with a large tensile force is obtained.

Description

technical field [0001] The invention belongs to the laser welding technology, in particular to a laser welding technology for electronic product components, in particular to the laser scanning path during the laser welding process. Background technique [0002] Laser welding is widely used in the electronics industry, especially in the microelectronics industry. Due to the small heat-affected zone of laser welding, rapid heating and low thermal stress, it is showing unique advantages in the packaging of integrated circuits and semiconductor device housings. In the development of vacuum devices, laser welding has also been applied, such as molybdenum Focusing electrode and stainless steel support ring, fast hot cathode filament assembly, etc. The elastic thin-walled corrugated sheet in the sensor or temperature controller is widely used in welding with a thickness of 0.05-0.1mm. However, in the existing welding equipment, lamp pumps, QCW, and CO2 gas lasers are basically use...

AI Technical Summary

Problems solved by technology

The elastic thin-walled corrugated sheet in the sensor or temperature controller is widely used in welding with a thickness of 0.05-0.1mm. However, in the existing welding equipment, lamp pumps, QCW, and CO2 gas lasers are basically used. At present In the process used, there are certain problems for spot welding between thin sheet materials below 0.2 mm. Since these types of lasers use each single pulse energy to reach the focal level, the focal spot is larger than 0.2 mm. For thin materials For example, it is easy to produce pores, the thermal conductivity is too large, the penetration rate is poor, the joint is easy to catalyze and soften, the single-point energy pulse is large, it is easy to cause gas overflow during welding, and it is easy to form cracks after welding. Through welding, the quality of welding on thin sheets is not high, and the yield rate is not high

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