The welding phase is perhaps the most important part of the production line
. There are several welding techniques employed, with the most common being high-frequency electric resistance welding (ERW) and submerged arc welding (SAW).4. Technology and Features Modern square pipe making machines come equipped with advanced technologies such as Computer Numerical Control (CNC), programmable logic controllers (PLC), and monitoring systems. The inclusion of these features enhances precision and efficiency but also raises the overall price.