Sdw-225ss— welder operating instructions – Multiquip SDW225SS User Manual
Page 34
PAGE 34 —SDW-225SS WELDER/GENERATOR— OPERATION & PARTS MANUAL — REV. # 2 (10/07/05)
SDW-225SS— WELDER OPERATING INSTRUCTIONS
Duty Cycle
The welder is rated at 100% duty cycle at 200 amps.
However the duty cycle depends upon the welding
current. Select the appropriate duty cycle from Table 12
to prevent overload.
Welding and Auxiliary Outputs.
The welding and auxiliary outputs can be used simultaneously,
subject to all of the following conditions:
z CC/CV Selector Switch is in the CC mode.
z CC Current Range Selector is in the low mode.
z Current Control is in the MAX position.
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Quality Welding Check Points
Adherence to the following rules will ensure quality welds.
■ Use only high-quality welding machines, electrodes and
welding accessories.
■ Know the base material you are working on.
■ Select the proper welding process to give the highest
quality welds on the base material to be used.
■ Select the proper welding procedure to meet the service
requirement.
■ Select the correct electrode for the job.
■ When preheating is specified or required, make sure the
temperature requirements are met. In any case, do not
weld on material below 32 °F without first preheating.
■ Clean the base metal of all slag, paint, grease, oil,
moisture and any other foreign materials.
■ Remove weld slag and thoroughly clean each bead prior
to making the next bead or pass.
■ Do not weld over cracks or porous tack welds. Defective
tack welds should be removed prior to welding.
■ Be particularly alert to obtain root fusion on the first pass
of fillet and groove welds.
■ When root gaps of groove welds are excessive, build up
one side of the joint prior to welding the pieces together.
■ When the root gap is excessive in fillet welding, be sure
to increase the size of the fillet weld to the amount of the
root gap in order to maintain the strength requirement.
In some cases it is advantageous to make a groove
weld in order to avoid extremely large fillets.
■ Inspect your work and immediately replace any defective
weld.
■ Observe the size requirement for each weld to ensure
you meet or slightly exceed the specified size.
■ Make sure the finished appearance of the weld is smooth
and that all overlaps and undercuts are repaired properly.
The strength of a weld should not be judged merely by
its external appearance.
NOTE
The 250 amp, 60% duty cycle
referenced in Table 12 is for CV
welding ONLY.