Submerged arc welding straight seam steel pipe welding introduction:

1, The bubble occurred in the middle of the weld, 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, moisture and Moisture and other substances, followed by the need to dry the flux 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.