Common problems in welding of metal access port materials.
Update:Dec 22,2022
Summary:I. Frequently Asked Questions of Metal Material Welding Metal welding defects seriously affect the service performance and service life of metal mater......
I. Frequently Asked Questions of Metal Material Welding Metal welding defects seriously affect the service performance and service life of metal materials. Common defects affecting service life in metal welding are as follows: 1. Crack phenomenon. There are two kinds of crack phenomena: hot crack and cold crack. Hot crack is the crack that appears when the metal develops from liquid to solid, and usually appears in the middle position, which is easy to find. Cold crack is the metal base material produced when the weld metal is cooled or after a period of aging after welding, or the area where the base material and the weld are fused. 2. Bite the edge. Edge bite refers to the pit at the edge of the weld seam. There may be two reasons for edge bite, one is caused by excessive welding current, too fast strip transportation speed or too long arc pulling, and the other is caused by too fast welding speed of submerged arc welding or unequal track of welding machine. 3. Pore. The common causes of blowholes are that the edge of the groove is not cleaned, leaving dirt or moisture. 4. Incomplete penetration and incomplete fusion. Incomplete penetration means that the root of the joint is not completely penetrated during welding. Unfusion is the phenomenon of local unfused bonding between weldment and weld metal or between weld layers. Incomplete penetration and fusion are serious defects in the welding of metal materials, which will lead to weld discontinuity, reduce weld strength, and then cause cracks. 5. Slag inclusion. Slag inclusion refers to the slag left in the weld.
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