Causes of porosity1. Base metal is dirty, the groove edge is not cleaned2. The composition and properties of the welding materials used are quite different from those of the base metal3. Welding shielding gas problema) Insufficient argon pressure in the cylinder;b) Excessive adjustment of welding ga

The submerged arc welding process is the most ideal choice for important applications in pipelines, pressure vessels and tanks, rail manufacturing and major construction. It has the simplest form of single wire, double wire structure, tandem double wire structure and multi-wire structure. The subme