Helvi UNITECH 328, Instruction Manual

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EN-19
Poor quality welds Nozzle clogged Clean or replace nozzle
Torch held too far from the
workpiece
Hold the torch at the right distance
Insufficient gas at weld area Check that the gas is not being
blown away by drafts and if so
move to more sheltered weld
area. If not check gas cylinder
contents gauge, regulator setting
and operation of gas valve.
Rusty, painted, damp, oil or greasy
workpiece
Ensure workpiece is clean and dry.
Rusty or dirty wire Ensure wire is clean and dry.
Poor ground contact Check ground clamp/workpiece
connection
Incorrect gas / wire combination Check on the manual for the
correct combination.
Weld deposit “stringy” and in-
complete
Torch moved over workpiece too
quickly
Move the torch slower
Gas mixture incorrect See shielding gas table
Weld deposit too thick Torch moved over workpiece too
slowly
Move the torch faster
Welding voltage too low Increase welding voltage
Wire pushes torch back from the
workpiece
Wire feed speed too fast Decrease wire feed speed
Bad connection between earth
clamp and workpiece.
Clean and deoxidate the contact
area of the earth clamp.
The workpiece is excessively
oxidized or painted.
Brush carefully the point to be
welded.