Projection Welding Defects And Causes. The longer the arc the more chances of getting this defect. When the rigidity of joints is great preheating and peening is required.
PROJECTION SIZE OR SHAPE. One projection can overheat which could lead to expulsion. Disadvantages of Projection Welding.
When welding multiple projections if the projections are not the same size shape or missing there is a potential for inconsistent welding.
Improper gas shielded may also cause this defect. Lamellar tearing is a type of welding defect that occurs in rolled steel plates that have been welded together due to shrinkage forces perpendicular to the faces of the plates. Welding defects are the irregularities that are formed due to the wrong welding process or due to inexperienced welders. Avoid rapid cooling of weld metal.