Faqs

BLOW HOLE – CAUSES AND REMEDIES
 
Cause
Remedy
·        Carbon content in basic metal or workpiece is so high.
·        Welding materials get humidity and surface of welding components is dirty, oily, rusty, vaporous,… during welding
 ·        Arc length is excessive and welding speed is high
 
·        Use welding materials with low carbon content
·        Before welding, keep welding materials dry and their surface clean.
·        Keep length of arc pole short and lower welding speed.
·        Not remove weld slag immediately after welding. Extend heating period of welds.
·        For MIG/MAG welding, use shielding gas properly with high purity. Gas supplied for welds must be sufficient during welding.