During the welding process of the SSAW pipe, the metal material leaks to the butt weld or weld that is not heated enough, and condenses into a metal tumor. This kind of metal nodules that cannot be fused together with the butt weld or the front welding is called welding nodules.
This type of defect makes the welding shape unattractive, and there are usually slag and incomplete penetration at the position where there is a weld bump during vertical welding. Weld flashes inside the pipe reduce the reasonable cross-section in the pipe in addition to reducing the compressive strength.
The welding flash not only affects the appearance of the welding, but also there are often defects such as lack of penetration under the welding flash, which is easy to cause stress. During vertical welding and horizontal welding, it is easy to cause welding tumors inside the pipeline, which will reduce the effective area of the pipeline and even cause pipeline blockage.
The root cause of welding flash:
1. The temperature of the molten pool is too high, the condensation is relatively slow, and the molten steel falls down under the action of its own weight to form welding lumps.
2. In vertical seam welding, side bar vertical welding or steel bar lap vertical welding, if the welding current is too large, the welding wire angle is wrong or the operation is not good, it is easy to cause this kind of failure.
How to prevent spiral steel pipe welding tumor
Welding lump refers to the unnecessary welding metal material other than normal welding. Weld flash introduces errors in the specification of the weld and creates stress zones at the seam. The temperature of the molten pool is too high, the solidification is relatively slow, and the molten steel may fall under the weight of its own weight to form weld bumps. In vertical welding of seam, vertical welding of side bars or vertical welding of steel bar lap, if the welding current is too large, the angle of welding wire is wrong or the operation method is not good, it is easy to cause this kind of failure.
This type of defect makes the welding shape unattractive, and there are usually slag and incomplete penetration at the position where there is a weld bump during vertical welding. Weld flashes inside the pipe reduce the reasonable cross-section in the pipe in addition to reducing the compressive strength.
The welding flash not only affects the appearance of the welding, but also there are often defects such as lack of penetration under the welding flash, which is easy to cause stress. During vertical welding and horizontal welding, it is easy to cause welding tumors inside the pipeline, which will reduce the effective area of the pipeline and even cause pipeline blockage.
The root cause of welding flash:
1. The temperature of the molten pool is too high, the condensation is relatively slow, and the molten steel falls down under the action of its own weight to form welding lumps.
2. In vertical seam welding, side bar vertical welding or steel bar lap vertical welding, if the welding current is too large, the welding wire angle is wrong or the operation is not good, it is easy to cause this kind of failure.
How to prevent spiral steel pipe welding tumor
Welding lump refers to the unnecessary welding metal material other than normal welding. Weld flash introduces errors in the specification of the weld and creates stress zones at the seam. The temperature of the molten pool is too high, the solidification is relatively slow, and the molten steel may fall under the weight of its own weight to form weld bumps. In vertical welding of seam, vertical welding of side bars or vertical welding of steel bar lap, if the welding current is too large, the angle of welding wire is wrong or the operation method is not good, it is easy to cause this kind of failure.
