Friction Stir Welding for Liquid Cold Plate Processing Technology

The liquid cold plate adopts friction stir welding process, which makes the water channel design more free, the sealing reliability is better, and the hard anode surface treatment can be used.

Friction stir welding is a solid phase connection method under the action of mechanical force and friction heat. In friction stir welding, a cylindrical stirring head with a special shaft shoulder and needle convex rotating slowly inserted into the welded workpiece, the friction shear resistance between the stirring head and the welded material produces friction heat, so that the material in the area near the stirring head is thermoplasticized (welding temperature generally does not reach or exceed the melting point of the welded material), when the stirring head rotates forward, The thermoplasticized metal material is transferred from the front edge of the stirring head to the back, and under the combined action of friction heat production and forging between the stirring head and the workpiece surface, a dense solid phase joint is formed.

Technical features:

1. no welding porosity defects in the weld, no element burning, no thermal cracks, never ensure no leakage of high reliability;

2. no segregation of elements and tissues during solidification, isotropic microstructure of the welding zone, no residual height;

3. the welding process is simple, belongs to the type of welding without adding flux: no wire filling, no groove, no pre-welding treatment, no protective gas;

4. the process of environmental protection, light and gas pollution;

5. the welding area is reduced, the deformation is small;

6. due to the high cost of equipment, the current processing cost is high, and the proficiency of technical workers is high.

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