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Is there any good method to weld?

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 Use brazing. 

The purpose of brazing is to allow the solder to melt into the weld after being heated. 

Tin soldering is usually a kind of brazing, but the formal concept of brazing is the first advanced technology used in aviation engineering.Copper or silver solder is used for copper pipes. 

Note: Brazing is not suitable for pressure pipe butt joint. When piping pressure is high, brazing shall be done by means of casing connection.

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