1. Bubble
Bubbles mostly occur in the middle of the welded trail, and the hydrogen is still hidden inside the weld metal in the form of air bubbles. The main reason is that the welding wire and the welds have moisture on the surface. Small, the welding speed is too fast, and this is the case to accelerate the coagulation metal.
2, bite edge
The bite edge is a V -shaped groove on the edge of the weld along the center of the weld. The main reason is that the welding speed, current, voltage and other conditions are produced. It is easy to cause bite defects.
3. Hot crack
The cause of thermal cracks is that when the weld is very stress, or the Si silicon element in the weld metal is very high, there is a sulfur crack. Steel), during the welding process, sulfide enters the cracks caused by welded metal.
4. Insufficient welding permeability
Internal and external weld metals are not overlapping enough, and sometimes it is not welded.
Calculation method: (outer diameter-wall thickness)*wall thickness*0.02466 = The weight of the welding pipe per meter {kg}
Galvanized pipe calculation: (outer diameter-wall thickness)*wall thickness*0.02466*1.06 = The weight of the welding pipe per meter {kg}
