Selection method: After the welding melt is cooled, if the metallographic structure of the welded part is consistent with the mold base material, the welding quality can be ensured; if it is inconsistent, sand eyes, cracks, or poor adhesion and falling off may occur.

Laser welding, welding material selection affects welding quality:

1. If the same metal strip as the base metal of the mold is selected as the laser cobalt-based welding wire, the metallurgical structure after the molten metal will be inconsistent with the base metal of the mold, which will affect the welding quality.

2. If a Cobalt Alloy Blade wire is selected, or a material close to stainless steel is used as a laser wire, the above problems will also occur, and the hardness after welding cannot be guaranteed. Because stainless steel has less carbon content and lower hardness, the welded position after welding is prone to wear.

3. For different mold materials, the choice of cobalt alloy wire type is not very strict, as long as the welding and the base material are welded and the hardness is consistent, the welding quality can be achieved.

4. The selection of common cobalt alloy welding wire with a diameter of 0.3mm, 0.4mm and 0.5mm, and the type of cobalt alloy welding wire is mainly determined according to the use and hardness of the mold. However, the use parameters of each laser welder are different. Therefore, when selecting the cobalt alloy wire type, the wire use instructions should be used as a reference, depending on the parameters and operating habits of the laser welder.

Since the laser welding wire is an alloy material, not a stainless steel wire, it may rust if it is not well preserved. Some laser welding wires are coated with a thin layer of anti-rust material on the surface, but the anti-rust layer of the plating should not be too thick, otherwise it will affect the welding quality, because the anti-rust layer is equivalent to impurities in the welding process. If the Cobalt Alloy wire is rusted, use sandpaper to polish the surface rust layer, which can be used without affecting the welding quality.