Why are some aluminum shells hard to weld when welding

Laser welding aluminum and aluminum alloys still have many applications, the key depends on your requirements and your welding materials, different materials will have a great impact on welding. Aluminum due to fast heat conduction, in the welding of a large amount of heat loss, so the use of high energy line heat source, in order to prevent the loss of energy, laser is one of the heat sources, and plasma welding, electron beam welding. But before welding to go through phosphating treatment

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