The defects that are prone to buried arc welding areas include pores, heat cracks, and bite edges.
1. Bubble. The bubbles mostly occur in the middle of the welding road. The main reason is that the hydrogen is still hidden inside the weld metal in the form of air bubbles. Therefore, the measures to eliminate this defect are to first remove the rust, oil, water and moisture of welding wires and welds. Waiting for the material, followed by drying the welding to remove the moisture. In addition, increase current, reduce welding speed, and slow down the coagulation speed of melting metal.
2. Sulfur crack (cracks caused by sulfur). Welding sulfur bias bands with strong plates (especially soft boiling steel) Cracks produced in the sulfur band into the welded metal. The reason is that there are hydrogen in the sulfur deviation belt containing low -melting points and steel in the steel. Therefore, in order to prevent this, the use of semi -semi -static steel or sedative steel with a less analytical belt is also effective. Secondly, the cleaning and drying of the weld surface and welds are also necessary.
3. Hot crack. In the buried arc welding, heat cracks can be generated in the welded channel, especially cracks are prone to occur at arcs and arcs. In order to eliminate this crack, the pads are usually installed at the arc and arc off the arc, and the spiral tube can be reversed and welded in the welded welding at the end of the roller. When the hot crack is very stressful, or the SI in the weld metal is high, it is most likely to produce.
4. Volume of welding slag. The welding residue is a part of the welding residue in the welded metal.
5. Poor welding degrees. Internal and external weld metals are not overlapping enough, and sometimes not welded. This situation is called insufficient welding degree.
6. Bite. The bite is a V -shaped groove in the center of the weld along the center of the weld. The bite edge is generated without the proper welding speed, current, voltage and other conditions. Among them, the welding speed is too high than the current is not suitable for the bite defect. The pipe is distributed in the same area, and it is higher than the general buried arc stitching pipe.
