Incomplete Penetration and Lack of Fusion Defects

During the welding process, if there is no tendency for partial melting between the steel plate and the welding electrode, incomplete penetration or lack of fusion defects may occur. Incomplete penetration defects mainly appear at the root of the welded joint, especially when the steel plate has a larger thickness, making the incomplete penetration phenomenon more pronounced. During the welding of spiral steel pipes, lack of fusion may occur in any part of the weld. It is evident that incomplete penetration and lack of fusion defects are major defects in the production of spiral steel pipes, and these defects will lead to a sharp decline in the overall quality of the steel pipes, thereby affecting their normal use.