Common defects in spiral welded steel pipe welding area
Spiral welded steel pipe welding area of ??the common defects are usually buried in the arc welding area prone to defects such as pores, hot cracks, and undercut. 1.bubble. Bubble occurred in the middle of the weld pipe of the welded steel pipe, the main reason is that hydrogen is still in the form of bubbles hidden in the weld metal inside, so the elimination of this defect is the first step must be removed welding wire and weld rust, oil, water And moisture and other substances, followed by the need to dry the flux to remove moisture. In addition, it is necessary to increase the current, reduce the welding speed and slow down the solidification rate of the molten metal. In addition to this defect, it is necessary to remove the rust, oil, moisture and moisture of the welding wire and weld, Heat the flux well to remove moisture. In addition, to increase the current, reduce the welding speed, slow down the melting rate of molten metal is also very effective....