Welding
Defect
Possible Causes Corrective actions
Improper joint preparation Joint design must be adequate to
provide access to the bottom of the
groove while maintaining proper nozzle-
to-work distance and arc
characteristics. Reduce root face
height. Provide or Increase the root
opening in butt joints.
Improper angle of Torch Position the Torch Nozzle and contact
tip at the proper travel angle to achieve
maximum penetration. Keep the arc on
the leading edge of the weld pool.
Lack of
penetration
Inadequate heat input Increase the wire feed speed to obtain
higher welding current. Maintain proper
nozzle-to-work distance.
Increase the shielding gas flow to
displace all air from the weld area.
Decrease the shielding gas flow to
avoid turbulence and entrapment of air
in the gas.
Remove spatter from the interior of the
gas nozzle.
Eliminate drafts (from fans, open doors,
etc.)
Allow the Gas to flow towards the
welding arc.
Use a slower travel speed.
Inadequate shielding gas
coverage
Reduce the nozzle-to-work distance.
Hold the gun at the end of the weld until
the molten crater solidifies.
Use only clean and dry electrode wire.Electrode contamination
Eliminate pickup of lubricant on
electrode in the wire feeder or conduit.
Work piece contamination Remove all grease, oil, rust paint and
dirt from work surfaces before welding.
Use a more highly deoxidizing
electrode.
Arc voltage too high Reduce operating voltage.
Porosity
Excess nozzle-to-work
distance.
Reduce electrode extension.
19
To Next Page
Loading...
