REHM FOCUS.ARC P 250, Руководство по эксплуатации

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Operation
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The REHM FOCUS.ARC P inert gas welding systems can be used to weld a
wide variety of materials, e.g. unalloyed and alloyed steels, stainless steels and
aluminium.
Various different wire diameters and materials are offered and used for
MIG/MAG welding. The diameter of the wire is based on the thickness of the
base material and the required welding current. The wire electrode material is
selected based on the base material and the desired quality of the weld seam.
The most common materials and their respective specifications can be found in
the relevant specialist literature.
Mixed gas consisting of argon with a content of 18 % CO
2
is mainly used for
welding steels .
Mixed gas consisting of argon with a content of 2 % CO
2
is mainly used for
welding stainless steels .
Pure argon serves as inert gas for aluminium .
The amount of inert gas required depends on the wire diameter, the gas
nozzle size, the welding current height and the air movement at the workplace.
The required gas quantity for mixed gases is approx. 7 ... 16 l/min, for argon at
approx. 10 ... 18 l/min.
General principle for the gas adjustment:
For steel: Wire diameter x 10 = gas volume in litres
For stainless steel: Wire diameter x 11 = gas volume in litres
For Aluminium: Wire diameter x 12 = gas volume in litres
The MIG/MAG welding torchesrecommended by REHM are to be connected in
gas-cooled design to the REHM units of the types FOCUS.ARC P
250, 300, 350,
400, 450, 250S, 300S, 350S, 350S, 400S and 450S , water-cooled torches of the
types 250W, 300W, 350W400W, 450W, 250WS, 300WS, 350WS, 400WS and
450WS.
The accessories for the torch depends on and must be matched to the particular
welding task.
Contact tips
Contact tips are wear parts and must be replaced periodically. Care must be take
to select contact tips of the correct size for the respective wire diameter.
Special contact tips for different wire diameters are available for aluminium
welding tasks, which can be found in the
REHM welding accessories catalogue.
Gas nozzles
Gas nozzles in different versions can be found in the REHM welding accessories
catalogue .
Wire liners must be selected to match the various different types of material and
wire gauges. The range for this can be found in the
REHM welding accessories
catalogue.
In addition, please refer to the instructions of the torch manufacturer (see
operating instructions).
The following points must be observed in order to achieve safe wire feeding:
Feed rollers must be selected to match the wire diameter.
Precise speed control of the feed motor ensures a constant wire feed speed.
Safe wire feeding is provided by the compact 4-roller system.
Weldable materials
Wire electrodes
Inert gas
MIG/MAG welding
torch
Torch
equipment
Wire liner
Wire feed setting