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adjusted accordingly. Arc Machines recommends that wire feed speed be
increased in stages and the hot wire voltage adjusted accordingly, until an
optimum balance between welding or cladding current, wire feed speed and
hot wire voltage is achieved. For new installations, a similar “trial and error”
procedure should be followed.
Welding with the Model 501 is application-dependent and thus giving specif-
ics for a particular welding procedure is not practical. However, in general the
operator forms a puddle with the GTAW system and begins feeding wire. Ide-
ally there should be no depression in the puddle. Wire melts as it enters the
puddle and rolls in smoothly. If a depression forms in the puddle or the wire
hits the bottom of the puddle, then adjust the hot wire power or wire feed
speed until the puddle smooths out. If the wire is “popping” in space and
burning back this indicates there is too much hot wire power or not enough
wire feed.
Good wire “stick-out” must be maintained. Stick-out is the length of exposed
wire between the end of the wire feed tube and the weld pool. Maintaining a
constant wire stick-out length and contact point on the puddle is important
for maintaining consistency of process from set-up to set-up. Changing the
stick-out changes the resistance value and makes it impossible to achieve
repeatability of process.
