Spot the Defect - Slag Inclusion in a CMT Process

This footage of a CMT (Cold Metal Transfer) process was taken with our Cavitar Welding Camera at 30 frames per second. In this video you can see a serious welding defect of slag inclusion taking place.

TWI Global (The Welding Institute - www.twi-global.com) describes slags as “the residue of the flux coating in MMA welding, it is principally a deoxidation product from the reaction between the flux, air and surface oxide. The slag becomes trapped in the weld when two adjacent weld beads are deposited with inadequate overlap and a void is formed. When the next layer is deposited, the entrapped slag is not melted out. Slag may also become entrapped in cavities in multi-pass welds through excessive undercut in the weld toe or the uneven surface profile of the preceding weld runs”.

This particular defect was produced on purpose by our partners at LAL - Laser Application Laboratory of Tampere University. While there could be a variety of reasons behind slag inclusions, in this case the defect was caused by too much silicone in the process, and to avoid this defect, a filler wire with less silicone should be used.

Read about Cavitar Welding Camera: https://products.cavitar.com/Welding_...

Read about benefits of Cavitar Welding Camera: https://products.cavitar.com/benefits...

You can also find us on other social medias:
Instagram:   / cavitar_ltd  
LinkedIn:   / cavi..  .
Facebook:   / cavitar.ltd  
Twitter:   / cavitarltd  

#welding #defects #Cavitar