Laser welding process

Laser welding is a new welding method, which mainly aims at the welding of thin-walled materials and precision parts, and can realize spot welding, butt welding, overlapping welding, sealing welding, etc. Its characteristics are: high depth-width ratio, small weld width, small heat affected zone, small deformation and fast welding speed. The weld seam is smooth and beautiful, and there is no need to treat it after welding or only a simple treatment process is needed. The weld quality is high, and there are no pores, which can reduce and optimize the impurities of the base metal, and the structure can be refined after welding. The strength and toughness of the weld are at least equal to or even higher than that of the base metal. It can be accurately controlled, with small focusing spot, high-precision positioning and easy automation. Welding between some dissimilar materials can be realized.

01 Laser self-fluxing welding
Laser welding works by using the excellent directionality and high power density of the laser beam. The laser beam is focused in a small area through the optical system, and a heat source area with highly concentrated energy is formed at the welded part in a very short time, so that the welded object is melted and solid solder joints and welds are formed.

Laser welding: large depth-width ratio; High speed and high precision; Small heat input and deformation; Non-contact welding; It is not affected by magnetic field and does not need vacuum pumping.

02 Laser filler wire welding
Laser wire-filler welding refers to a method of forming a welded joint by pre-filling a specific welding material in the weld and melting it by laser irradiation or filling the welding material at the same time of laser irradiation. Compared with non-wire-filled welding, laser wire-filled welding solves the problem of strict requirements for workpiece processing and assembly. Can realize welding thicker and larger parts with lower power; By adjusting the filler composition, the microstructure and properties of the weld area can be controlled.

03 Laser flying welding
Remote laser welding is a kind of laser welding method which uses high-speed scanning vibrating lens to process long working distance. It has high positioning accuracy, short time, fast welding speed and high efficiency; Will not interfere with the welding fixture, less optical lens pollution; Welds with arbitrary shapes can be customized to optimize structural strength. Generally, the weld is not protected by gas, and the splash is large. It is widely used in thin and high strength steel plates, galvanized steel plates and other products such as body panels.

04 laser brazing
The laser beam emitted by the laser generator is focused on the surface of the welding wire and heated, so that the welding wire is heated and melted (the base material is not melted) to wet the base material, fill the joint gap, and combine with the base material to form a weld to realize a good connection.

05 laser swing welding
Through the swing of the reflecting mirror in the welding head, the laser is controlled to swing and stir the welding bath, so as to promote the gas to overflow from the bath and refine the crystal grains. At the same time, it can also reduce the sensitivity of laser welding to the gap of incoming materials. Especially suitable for weld aluminum alloy, copper and heterogeneous material.

06 laser arc hybrid welding
Laser-arc hybrid welding combines two laser and arc heat sources with completely different physical properties and energy transmission mechanism, forming a brand-new and efficient heat source. Characteristics of composite welding: 1. Compared with laser welding, the bridging ability is enhanced and the structure is improved. 2. Compared with arc welding, it has small deformation, high welding speed and deep penetration. 3, and the length of each heat source and make up their own shortcomings, 1+1>2.

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