OPERATION | ||
|
|
|
ELECTRODES AND EQUIPMENT
TheTandem MIG torch has been designed for use with 0.035" through 5/64" (0.9 mm to 1.9 mm) Lincoln solid steel MIG wires and metal core wires. Refer to the appropriate Lincoln Process and Procedure Guidelines for further information on welding settings.
MAKING A WELD
WARNING
• When using an open arc process, it is necessary to use correct eye, head and body protection.
a)Check to make sure the welding power sources are turned on and set to the correct parameters and programs.
b)Verify that the shielding gas supply is on and set for the correct flow rate.
c)Set the preflow and postflow times the same on both wire feeders. Make sure the post flow is long enough to provide shielding during any crater fill operation.
d)Check that all of the water coolers are operating properly.
e)If applicable, make sure the
f)Position the torch over the joint.
WARNING
•Automatic equipment may start unexpectedly.
g) Make a weld by sending a trigger signal to the welding power sources.
AVOIDING WIRE FEEDING
PROBLEMS
Wire feeding problems can be avoided by observing the following procedures:
a)Do not use a torch with cables longer than neces- sary.
b)Do not kink or pull the cable around sharp corners.
c)Keep the cable as straight as possible when welding or loading electrode through the cable.
d)Do not allow dolly wheels or trucks to run over cables.
e)Use only clean,
f)Replace the contact tips when the arcs start to become unstable or the contact tip ends are fused or deformed.
SHIELDING GAS DELIVERY
Adjust flow regulators for prescribed gas flow. Inspect hoses regularly for worn or torn hoses. Perform a soapy water test on hoses if a leak is suspected. Avoid kinking or collapsing hoses with cable clamps. Insure that dif- fuser is properly seated and tight. For
AIR BLAST CLEANING
The welding torch is equipped with a separate gas hose for the purpose of providing a high pressure air blast through the nozzle area to clear loose spatter that may have accumulated between the two diffusers.
The
NOZZLE REAMING STATIONS
During robotic applications a reamer should be employed to keep the nozzle clean. Reaming the nozzle between welds will reduce the down time associated with manual torch cleaning. The
ANTI- SPATTER SPRAY
Care should be taken to apply the right amount of anti- spatter to the internal area of the nozzle. Too much anti - spatter will cause diffuser clogging and weld porosity.
Only a very light covering of
TANDEM MIG TORCH