Cloos MHW 350 SZ Spare Parts List - Page 3

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Operating instructions for MIG/MAG welding torches
The manual and machine welding torches in this product series are
exclusively suitable for use with inert or active gases, universally and in
all common welding positions.
The standard design comprises: handle with controlling devices for max.
42 V and 0.1 to 1 A, cable assembly lengths of 3 m, 4 m or 5 m for
manual torches and 1.2 , 1.5 , 2 and 3 m for machine torches.
Please see the current order documents (sales documents) for various
fittings such as connections, handles, wear parts and other accessories.
MIG/MAG welding torches may be gas-cooled or water-cooled.
Water-cooled torches require a cooling radiator.
Commissioning
Prepare cable assembly:
The guide liner or plastic liner is pushed through the straight cable
assembly from the central connection (connection piece) and is clamped
with the clamping cone.
Prepare torch neck:
1. Manually screw on the gas distributor or spatter protection.
2. Use a spanner to tighten the current tip.
3. Fasten the gas shroud with a rotary motion (movement).
Connect torch:
The standard connection on the machine side is a „SZ" connection for
water-cooled manual and machine torches and a „Z" connection for gas-
cooled torches.
Connect cooling liquid advance:
The water advance hose is marked blue and must not be mixed up with
the water return hose on the cooler. The water circulation must be
checked during the first commissioning and after each change of the
cable assembly.
Connect cooling liquid return.
Shielding gases:
The shielding gas is taken from steel bottles or a closed circular pipeline.
The gas quantity is set on the pressure reducing valve. Choke diameter
for manual and automatic operation is 0.6 and for robot operation 0.85.
The following gases are used for MIG/MAG welding:
Pure Argon, CO
, mixtures of Argon and CO
2
Flammable gases or gases which induce a chemical reaction, such as
Acetylene, Propane, pure Hydrogen, pure Oxygen are prohibited.
Torch of the voltage class L (up to a peak value of 113V)
Operating and maintenance instructions
Cable assembly:
* Prior to connection to the wire feed unit make sure that the correct
liner is used in accordance to the wire type and diameter.
* Compressed air should always be blown through the wire guide hose
when the wire coil has been exchanged.
* Make sure that the screwed connections are correctly tightened.
* Damaged, deformed or worn parts have to be exchanged or returned
for repair.

Problems during operation

Faults
No arc
Arc between gas shroud and workpiece
Overheated torch body or supply lead
Welding wire melted with current tip
Irregular wire feed
EN 50 078
or Argon, CO
2
Torch:
* Make sure that the correct current tip is used with regard to the wire
diameter and type of wire.
* When changing the wire coil it is important that the wire beginning
is without burr.
* Remove the weld spatters from the interior of the gas shroud and
spray with original Cloos torch spray.
* When water-cooled torches are used the function of the cooler
must be guaranteed.
Safety precautions
The use of the welding torches is safe when the common safety
regulations are kept:
* Commissioning is reserved to qualified persons who are familiar with
the use of arc welding machines.
* Arc welding may be harmful for eyes, skin and ears ! Protective
clothing, eye and ear protection according to UVV 26.0, VBG 15 rules
should be worn.
* The given load data are maximum limit values. Overload will
inevitably damage the torch.
* The power source must always be switched off when wear parts
are exchanged.
* The operating instructions for the individual welding components
such as power source, wire feed unit and cooler must be
adhered to.
* The torch trigger should only be pressed when all conditions for
a safe welding are fulfilled.
* Never pull the cable assembly over feather edges or deposit it within
the range of spatters or on hot workpieces.
* Protect other persons by curtains and protective walls against optical
rays and the danger of glare.
* The instructions of the gas manufacturers and the high-pressure gas
rules are important for handling the gas bottles (cyliders).
* Workpieces which have been degreased with a chlorinated solvent
must be washed down with clear water before welding to avoid the
danger of phosgen gas formation. For the same reason chloric
degreasing bathes are not allowed in the proximity of the welding
location.
* All metal vapours are toxic! Be careful with lead, nickle, chrome,
cadmium, copper, zinc, berillium. If necessary a ventilation or
aspiration must be used to avoid that the MAK values are exceeded
(MAK „ maximum concentration of harmful working materials on the
and O
.
work place).
2
2
* Please observe the weld area and its surroundings when welding
has finished. Fire may break out later due to smoldering.
Warranty
This MIG/MAG welding torch is an original Cloos product. Cloos
Schweißtechnik GmbH guarantee for a faultless production and function
according to the state of art and the existing provisions. Guarantee can
only be claimed for defective material but not for damages due to normal
wear, overload or inexpert handling. There is no warranty against wear
parts. Original Cloos spare parts must be used only for each welding
torch.
Possible causes
- Current supply to the workpiece or torch is interrupted
- Faulty power source or control
- Control lead interrupted
- Switching protection in the power source is not activated
- Bridge formation inside the gas shroud due to weld spatters
- Insufficient flow of cooling liquid
- Welding current too high
- Cooling liquid hose or water-cooled current cable too narrow or
closed
- Current tip is not correctly tightened
- Wire feed starts too late
- Wire is jammed in the wire guide hose due to severe contamination
or too strong bending
- Wire feed speed is too low
- Current tip distance to the workpiece is too large/too small
- Too low pressure of pinch roller
- Faults in the wire guide hose
- Wrong guide liner or liner (core)
- Problems in the control
- Wrong wire feed rollers or rollers too severely worn