What Are The Factors Of Spiral Submerged Arc Welding Steel Pipe Appear Cross Grain

Spiral submerged arc welding steel pipe in the specific production process if the problem of transverse lines, how should we find the cause to eliminate the problem?

First of all, it may be due to the role of stress in the spiral submerged arc welded steel pipe. That is, the residual stress and welding stress after steel pipe molding.

Secondly due to the presence of hydrogen. Such as insufficient flux drying, insufficient preheating temperature or no preheating before welding, and insufficient interlayer temperature for multi-layer welding.

Spiral seam submerged arc welded steel pipe

Metallurgical factors of spiral welded steel pipe. Welding process has a low melting point impurities into, such as copper and copper alloy. The source of copper is mainly copper plated on the surface of the wire used to prevent corrosion of the wire. These copper shavings enter the flux from the inner hole of the conductive nozzle and contact the weld molten pool during the welding process resulting in transverse cracks.

Spiral seam submerged arc welding steel pipe welding process is unreasonable. Such as the weld forming factor is too small, the preheating temperature is not enough or not preheated before welding, welding line energy is too large, improper heat treatment after welding, insulation time is too short.

Spiral seam submerged arc welded steel pipe connection if there is welding slag with argon arc welding, or wait for the stainless steel welded pipe cooled, with a hammer, it will come off, both methods are relatively simple, but may not clean up. Welding slag is better to clean up is the spatter slag is not good to clean up, the welding slag can be cleaned up with electric grinding, otherwise the welding slag is very difficult to be cleaned up.

As for the spiral welded steel pipe cutting some defects we can also remove, but to remove these defects to find a reasonable method, only the right way to make up for the defects of the welded pipe. For these defects can find the corresponding solution, but if the method to find the right way will make the use of more trouble. For the welded pipe in cleaning up the welding slag there is a method is to use a file, with a file can also be cleaned up the welding slag is very clean. There is a more simple and labor-saving method is to take a saw blade or half with can, reach into the pipe, the left hand to take the pipe, the right hand to take the saw blade, clockwise or counterclockwise to the arms of the pull. This will get the weld slag cleaned out of the pipe very well and won't waste much time, simple and easy.