√Three times plastic surgery during welding the flange with the pipe and using special the S-A positioning that can be make the flange flat.This can make sure the headers assemble easily and save labor cost.
√Strick quality control, each product should be checked by the accurate fixture tools to make sure each product will not have the assemble products.
√Using the SS316L material welding wire which can make the welding more stronger,resistant to rust, it will not leakage duering the using life.