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18
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Connection to Welding Power Supply
CAUTION
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Make sure to tighten the collet body and torch body firmly. If either
of them is loose even slightly, the collet may be burned and seized
or the operator may get burn due to heat-up.
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Refer to the instruction manual for each welding power source, and connect the torch properly.
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Requirements
11.1 When mounting this torch on the robot, connect the lead wire of the power cable to the connection part of
the workpiece-side welding cable of the electrode.
11.2 If there is any loosened part in any connection of the torch, heat generation and leakage of water, gas or air
may result. Make sure to tighten the connections securely.
11.3 Keep the gas flow rate at 7~8 l /min. for AC and 5~6 l /min. for DC for normal operations. When a gas lens
is in used, sufficient shield effect will be obtained at a lower rate. When it is windy, or the workpiece and the
torch need to be moved farther away from each other, raise the flow rate as required.
11.4 Keep the flow rate of the coolant at more than 1.2 l /min.
Appropriate water pressure is 0.1 (1kg/cm
2
) ~ 0.3 (3kg/cm
2
) MPa.
DO NOT use the coolant at the pressure of more than 0.3 MPa (3kg/cm
2
).
Lower than 25
°
C is desirable for the temperature at the inlet.
11.5 Although the cable hose, gas hose, and coolant hose are all protected by hose sheaths, DO NOT put any
heavy piece on top of these cables, cause them to contact hot parts of the weldment, nor to be bent by
force.
11.6 Always keep the tungsten electrode clean.
1) When spatters stick to the electrode, generate arc on other steel plate, and it will be cleaned.
2) When granular structure is formed on the tip of the electrode, sharpen the tip by a grinder and so on to
form acute angles.
3) When the electrode sticks into the molten pool, turn OFF the power, take out the electrode and break it
at the lowermost part of the electrode. Then, finish the tip of the electrode with a grinder and so on.
11.7 Keep the nozzle clean as well. Remove its cap occasionally and check for any abnormal conditions.
11.8 Even when any external abnormal conditions cannot be observed, periodic inspection on worn parts is
desirable for maintenance of the torch and obtaining fine results of welding.
11.9 The shock sensor unit is to minimize deformation of the welding torch likely caused by the collision among
welding torch, workpiece or jigs, and damage inflicted on the robot body, workpiece or jigs. Therefore,
reproducibility on the torch tip cannot be guaranteed if once the shock sensor has been operated. (If once
the shock sensor has worked, check the aiming point of torch again with the torch gauge.)
