Glossary of welding defects in a weld

Mig Welders — Sat, 02 May 2009 09:02:31 +0000

Undercut
Undercut and is that part of the groove as end or both ends of the weld bead. As a common cause, TIG welding, excessive current, or the lack of bar pressure. The semi-automatic welding voltage is too high, under-current. Arc welding and coating is excessive current. Other bars occur by chance or unstable conditions for the angle of the welding torch.

Overlap
Lap and over is that the portion of the base material SA covered KEMAZU end or both ends of the weld bead. Over the excessive heat, multi-layer height is one of the defects usually occur in the welding direction and set direction. As a common cause, current, voltage is the reverse of the undercut.

Crater crack
And crater cracking, hot cracking can occur from the crater of the weld bead. And properly handle the crater, crater current adjustment may be eliminated by altering the flow after a time.

MI slag
MI and slag is that it remains in the slag without surfacing welding metal impurities in the molten slag and weld during welding. The monolayer height is more likely if the proper torch angle, must be done in full multi-layered to ensure removal of the slag below prime.
The naked eye can not see is one of the weld.

MI tungstenic
The tungsten is MI, TIG tungsten is melting down of the welding electrode is to get a healthy mix of internal weld bead.
The naked eye as well as slag inclusion is not visible, it is pointed out flaws in the welding and inspection of radiation tests.

Under bead cracking
Under bead cracking is cracking that occurs in the bottom of the weld bead, the bass is a kind of crack. Crater crack is hot cracking.

Pit
The pit is that the welding defect occurs NDA small hole on the surface of the weld bead. Also called general porosity of the cavity defects such Kubo Miya.

Blowholes
Blow hole is that there would not float to the surface in a circular cavity of welded metal. Like the crack in the weld must be rigorous inspection process and the gouging defects.

RAMERATEA
RAMERATEA and is a matter of breaking the weld as the weld peeling.
It is vulnerable to defects in the heavily distorted by the welding. For example, the welding occurs RAMERATEA your backside and do it completely in the grinder to one side in the weld bead after welding SE both.

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Glossary of welding defects in a weld