The main causes of the common defects of spiral steel pipe welds are the following, let us understand what are the countermeasures!

  The first common problem is that the weld width is uneven or curved. The causes are uneven welding speed, unstable welding voltage, and uneven wire feeding speed

1. Poor wire conductivity, unclean wire surface

, The conductive tip is unreliable, there are more oxide scales on the edge of the bevel, the flux bowl and rubber baffle are not suitable, and the flux particles are too large or have more powder. The solution to this problem is to maintain stable welding specifications, eliminate wire feeder failures, remove grease on the surface of the welding wire, etc., replace the conductive nozzle (block), the diameter of the conductive nozzle is appropriate, the conductive part of the inner hole should not be too long, the groove should be cleaned Good flux bowl and rubber baffle to ensure uniform flux particles.

  The second common problem is Yu Gaochao. The reason is that the current is too large and the voltage is too low, the inclination angle is too large during the uphill welding, the wire feeding speed is too fast, and the welding wire melting amount is large. The method of treatment is to adjust the welding specifications, adjust the slope of uphill welding, and adjust the wire feeding speed.

  The third common problem is undercutting. The cause of the problem is that the position or angle of the welding wire is inappropriate, the current is too large, the voltage is too low, the welding speed is too fast, the molding is wrong or squeezed, the wire feed is uneven, the welding head is not fixed well, and the welding head swings during welding. The treatment method is to adjust the welding wire position or angle, adjust the process parameters, the welding current should not be too large, eliminate the molding error or squeeze the thickness, replace the wire feed wheel or bearing, repair the electrical system, and fix the welding head.

  The fourth common problem is unfused. The cause of the problem is that the welding wire is misaligned, is biased to the side of the groove, the welding seam is bent too much, and the welding current is too small. The treatment method is to adjust the position of the welding wire, concentrate on the energy, and carefully operate and adjust the welding current.

  The fifth common problem is poor penetration. The cause of the problem is that the welding wire is misaligned, too far from the normal position, the wire current is too small, or the voltage is too large, the welding speed is too fast, the blunt edge of the groove is too large or the angle is too small, the welding depth is not cleaned enough The forming gap is too small. The treatment method is to adjust the normal position of the welding wire, adjust the welding current and welding voltage, adjust the welding speed, correct the obtuse angle and included angle of the groove, clean the depth of the welding root, and adjust the forming gap.

  The sixth common problem is slag inclusion. The cause of the problem is that the edges are not clean, when the multi-layer welding, the slag between the layers is not thorough, the welding current is too small, the welding speed is too fast, the welding wire is improperly positioned, the slag and the molten iron are not clearly separated, the weld width and depth If the ratio is too small, the undercut is too deep, the bevel angle is too small, the flux is not clean, and there is debris. Common treatment methods are to remove the edges of both sides of the strip, thoroughly remove the slag between the layers, adjust the welding current and welding voltage, adjust the position of the welding wire, increase the weld width and penetration ratio, increase the angle of the groove, and remove the debris from the flux