Power Fist SMART TIG AC/DC-200P Manuel De L'utilisateur page 19

V4.1
6. The gas will continue to flow to protect the weld for 0.1 to 10 seconds. The post-gas can be set with the adjustment
knob on the front panel
7. The electromagnetic valve closes and stops the gas from flowing.
8. The welding task is complete.
SHUTTING DOWN THE WELDING UNIT
Once the welding job is complete, the welding unit and gas cylinder must be shut down. The torch nozzle will still be hot.
Take precautions to avoid a burn injury.
1. Turn off the welding unit.
2. Disconnect the ground clamp to prevent an electrical circuit from forming.
3. Place the torch down so the hot nozzle is not touching anything flammable.
4. Shut the gas cylinder valve by turning clockwise. Leave the regulator valve open.
5. Switch the welding unit on.
6. Pull the trigger until the regulator shows zero pressure and no gas is flowing from the nozzle.
7. Turn the welding unit off and store the torch.
8. Shut the regulator valve.
ARC WELDING DEFECT AND PREVENTATIVE TIPS
Defect Reasons
Welding seam The groove angle is not proper.
doesn't meet
The root face and assembly gap are not
the welding
equal.
standards.
Welding technical parameters are incorrect.
More welding experience is required.
Crater Abrupt end to welding causes puddle to
cool too quickly.
Too much current in the welding of a thin
plate.
Undercut Not enough current applied to weld.
Arc length is too long.
The electrode angle is wrong or improperly
applied to weld.
Incomplete The groove angle or gap is too small and
penetration the root face is too large for a secure weld.
Welding parameters are not correct for
materials being welded.
Arc length is too long.
Shield gas is blown away.
More experience is required.
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SMART TIG AC/DC-200P Inverter Welding Machine
Preventative Methods
Choose the proper groove angle and assembly gap
to improve the assembly quality.
Choose the proper welding parameters.
More practice is required.
Gradually reduce the current and continue to feed
rod/wire into the welding puddle to allow it to slowly
cool. Move the rod to the side of the puddle before
removing it.
Reduce current when welding thin plate.
Choose the proper welding current and speed of
travel.
Reduce gap between electrode and workpiece to
control arc length.
Consult a welding manual to determine the
correct angle, speed and current for the welding
task attempted.
Adjust the welding technique for the groove size.
Select the suitable welding current and speed.
Reduce gap between electrode and workpiece to
control arc length.
Check that correct gas is being used at the correct
CFM to prevent turbulence. Erect a wind shield
around welding area.
More practice is required.
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