FRONIUS Welding Torch MHP 320i W PM

- Remove welding spatter from gas nozzle

* Check the gas nozzle, spatter guard and insulation for damage and replace any damaged components.

- Also at every start-up when using water-cooled welding torches:

- check all coolant connections for tightness (no leaks)

- check that the coolant can flow unhindered

Every time the wirespool/basket-type spool is changed:

NOTE: Always change feed rollers in pairs.

Only use feed rollers that match the wire diameter used and the wire alloy.

An overview of available feed rollers can be found in the Spare Parts Lists.

NOTE: To tighten the new feed rollers, use the screws supplied with the new rollers.

Turn the feed roller onto the drive until the splines on the feed roller engage in the grooves on the drive.

Sign off on the feed rollers change

Warning: Ensure the machine is turned off and cooled down before starting the procedure.

Wire electrode removed from the hosepack

Infeed nozzle pushed in as far as it will go

Inner liner inserted as far as it will go into the infeed nozzle

Cap screwed onto the inner liner as far as it will go

NOTE: Steel inner liners with an outer diameter of less than 1 mm (0.039 in.) cannot be screwed into the welding torch - the specified tightening torque therefore does not apply to these liners.

All other inner liners screwed into the welding torch and tightened to the specified tightening torque

Sign off on the infeed nozzle change

Warning: Check the clamping nipple before commissioning and whenever the inner liner is changed.

Visual inspection of brass clamping nipple with seal ring

Visual inspection of silver clamping nipple with see-through bushing

NOTE: Incorrect or defective clamping nipple in push applications causes gas loss and poor weld properties.

Check that the seal ring is intact

NOTE: Incorrect clamping nipple in push-pull applications causes tangled wire and increased abrasion in the inner liner when using a clamping nipple with seal ring.

Sign off on the clamping nipple check

CAUTION: Risk of burns from hot coolant and hot torch body.

Before carrying out any work, allow the coolant and torch body to cool to room temperature (+25 °C, +77 °F).

NOTE: Some coolant will always remain in the torch body.

Only remove the torch body with the gas nozzle pointing downwards.

NOTE: Before fitting a torch body, ensure that the interface between the torch body and the hosepack is clean and undamaged.

NOTE: The torch body is in the 0° position when the dowel pin (1) on the hosepack engages in the locating hole (2) in the torch body.

Ensure that the union nut is tightened as far as it will go.

Sign off on the torch body change