1.2.2 About Welding; Preparations; Unpacking; Positioning And Location Of The Machine - Kemppi Kempact 251R Operating Manual

1.2.2 About welding

In addition to the welding machine, welding outcome is influenced by the work piece to be
welded, welding technique and the welding environment. Therefore, recommendations in this
manual must be followed.
During welding, an electric welding circuit is created between the filler wire and the welded
piece. On delivery, the welding gun euro connector is connected to the positive pole. The
terminals are located inside the wire feed case door and should not be changed unless you
intend to run a filler wire that is directed to be used in reverse polarity, electrode negative.
When a filler wire is loaded to the machine and the gun trigger is pressed, the wire feed
mechanism drives the filler wire through the wire liner to the contact tip mounted in the
welding gun. The earth return socket on the back of the machine is set as the negative
terminal, and when connected to the workpiece via the earth return lead, it completes the
welding circuit.
When the filler wire touches the work piece, a short circuit occurs, forming the needed closed
electrical circuit. A welding arc is formed and welding commences. Unrestricted current flow
is possible only when the earth return clamp is properly attached to the workpiece and the
fixing point of the clamp to the workpiece is clean, and free from paint and rust.
EN
2.

PREPARATIONS

Please read the separate safety instruction booklet provided before you commence welding.
NOTE!
Pay particular attention to the risks associated with fire and explosion.
2.1

Unpacking

When the machine leaves the factory, the wire drive system and gun it is set for use with
ferrous filler wire (181/251 models WHITE 0.8 wire feed rolls and 253/323 models RED 1.0
wire feed rolls). If you wish to use an alternative thickness filler wire or type, make sure that
you select appropriate feed rolls/groove size, welding gun contact tip and gun liner, and also
ensure that the machine polarity is correctly set for the material filler type used.
If using aluminium or stainless steel filler wire, we recommend you change the wire liner to a
Kemppi plastic type, which is better suited for the material.
Before using the equipment, always make sure it was not damaged during transportation.
Also check that you have received what you ordered and that there are instructions for it.
The packaging material of the products is suitable for recycling.
Environment
The machine is suitable for both indoor and outdoor use, but it should be protected from rain
and sunshine. Store the machine in a dry and clean environment and protect it from sand and
dust during use and storage. The recommended operating temperature range is –20...+40 °C.
Place the machine in such a way that it does not come in contact with hot surfaces, sparks and
spatters. Make sure the air flow into the machine is unrestricted.
2.2

Positioning and location of the machine

Place the machine on a firm, dry and level surface. Where possible, do not allow dust or other
impurities to enter the machines cooling air flow.
Notes for positioning the machine
• The surface inclination should not exceed 15 degrees.
• Ensure the free circulation of the cooling air. There must be at least 20 cm of free space
around the machine for cooling air to circulate.
• Protect the machine against heavy rain and direct sunshine.
The machine should not be operated in the rain as the protection class of the machine,
NOTE!
IP23S, allows for outside preserving and storage only.
Never use a wet welding machine.
NOTE!
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Kempact 251R, 253R, 323R, 181A, 251A, 253A, 323A