Manufacture of kettle body (kettle body includes spout, kettle upper part and kettle lower part):

A. The manufacturing process of spout is: blanking, stretching, shaping, punching, trimming and cleaning;

B, the manufacturing process of the upper part of the kettle is: blanking, stretching, punching and cleaning;

C, after the above procedures are completed, butt welding the manufactured spout with the upper part of the kettle body, and then performing primary shaping, secondary shaping, trimming, flanging, gear hobbing and cleaning;

D, the manufacturing process of the lower part of the pot is as follows: blanking, stretching, shaping, trimming and cleaning;

E, butt welding the semi-finished product prepared in step c with the lower part of the kettle.