Which welding method is more suitable for the piston rod?

Friction welding can be used, and it is welded after the finished product. It can be welded directly after chrome plating, and the cylinder can be directly installed after turning the flash. This technology is already a very mature process in the foreign piston rod industry. ! So what are the advantages of this welding technology?
1. First of all, the cost of welding is very low, only the right amount of electricity is needed, and no flux is required;
2. Secondly, the efficiency of the whole welding is very high, and a piston rod can be welded in just two or three minutes;
3. The quality of re-welding is relatively high-quality, and the strength of the entire weld is basically close to the requirements of the parent body;
4. It is not only safe but also very environmentally friendly, without any sound, gas, light and radiation pollution.