Table of Contents
Advertisement
Possible causes
A.
Improper point preparation
B.
Improper welding technique
C.
Inadequate heat input
A. Inadequate shielding gas coverage
B.
Electrode contamination
C.
Work piece contamination
D.
Arc voltage too high
E.
Excess nozzle-to-work distance
3.
Lack of penetration
Joint design must be adequate to
provide access to the bottom of the
nozzle-to-work distance and arc
characteristics. Reduce root face height.
Provide or Increase the root opening in
Position the electrode at the proper
Keep the arc on the leading edge of
Increase electrode feed to obtain
4.
Porosity
Increase the shielding gas flow to
displace all air from the weld area.
Decrease the shielding gas flow to
avoid turbulence and entrapment of
Remove spatter from the interior of the
gas nozzle. Eliminate drafts (from fans,
Reduce the nozzle-to- work distance.
Hold the gun at the end of the weld
Use only clean and dry electrode wire.
electrode in the wire feeder or conduit.
Remove all grease, oil, rust, paint and
dirt from work surfaces before welding.
23
Corrective actions
grove while maintaining proper
butt joints.
travel angle to achieve maximum
penetration.
the weld pool.
higher welding current. Maintain
proper nozzle-to-work distance.
air in the gas.
open doors, etc.) blowing into the
welding arc.
Use a slower travel speed.
until the molten crater solidifies.
Eliminate pickup of lubricant on
Use a more highly deoxidizing
electrode.
Reduce operating voltage
Reduce electrode extension.
Advertisement
Table of Contents
