Kemppi Evo 170 - Manual (Page 6)

EN
You can use steel (solid or cored wire), stainless steel, aluminium and CuSi as filler wire in the
machine. The steel wire can be 0.6 mm, 0.8 mm, 0.9 mm or 1.0 mm thick, but the machine’s
welding properties are optimum with a steel wire of 0.8 mm diameter. The stainless steel wire
can be 0.8 mm, 0.9 mm or 1.0 mm in diameter, the aluminium wire 1.0 mm and CuSi wire 0.8,
0.9 and 1.0 mm.
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 positive and negative
poles of the machine. On delivery, the welding gun is connected to the positive pole of the
machine terminals. The terminals are located inside the 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, the wire feed mechanism drives the filler
wire through the contact tip mounted in the welding gun, and thus transfers electrical power
from the contact tip to the filler wire. The earth return clamp and cable (already connected to
the machine on delivery to the negative terminal) connects to the workpiece to be welded.
When the filler wire touches the work piece a short circuit occurs, forming the needed closed
electrical circuit, an 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.
Shielding gas must be used during welding in order to prevent air from mixing with the weld
pool. Pure carbon dioxide or a mixture of argon and carbon dioxide is a suitable shielding
gas for steel filler wire. Argon + 2 % CO₂ mixture is suitable for stainless steel wires. Argon is
suitable for welding aluminium and CuSi wires. Some filler wires (referred to as self shielded)
form a gas shield from the burning composition of the wire’s core, thus eliminating the need
for a separate shielding gas supply.
2. BefOre yOu start using the unit
NOTE! Please read the separate safety instruction booklet provided before you commence welding.
Pay particular attention to the risks associated with fire and explosion.
2.1 unpacking
When machine leaves factory, it is set up for use with 0.8 mm diameter filler wire. If you wish
to use an alternative thickness filler wire or type, make sure that you suitably adjust the feed
roll groove, welding gun contact tip and machine polarity for the material type selected.
If you mainly use 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.
Always before using the equipment, 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.
transportation
The machine should be transported in an upright position.
NOTE! Always move the welding machine by lifting it from the handle. Never pull it from the
welding gun or other cables.
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 in the machine is unrestricted.
MinarcMig Evo 170, Evo 200
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