Würth MIG 180-5S Mode D'emploi Original page 30

standard delivery scope of the product.
Installation
1. Connection to power supply
Consult a qualified electrician for proper
installation of needed socket.
1. Make sure the on/off switch is in its off position.
2. Connect the plug with a suitable socket.
WARNING!
- Check the voltage! The voltage must comply with
the information on the rating label!
- This product is classified as a protection class I and
must therefore be connected to an earthed socket!
2. Extension cord
NOTE: During normal use an extension cord should
not be used. It is strongly recommended that an
extension cord should not be applied because of the
voltage drop they produce. This voltage drop can
affect the performance of the welder. In case it is
necessary, ensure the extension cord has proper size
and type for the product (≥ 4.0 mm² ). Do not use
an extension cord longer than 7.5 m.
3. Setting up the work piece
3.1 Welding positions
There are two basic positions, for welding: Flat and
Horizontal. Flat welding is generally easier, faster,
and allows better weld fusion. If possible, the work
piece should be positioned so that the bead will run
on a flat surface.
3.2 Preparing the Joint
Before welding, ensure that the surface of work piece
is free of dirt, rust, lime scale, oil or paint. Otherwise,
it will create brittle and porous weld. If the base metal
pieces to be joined are thick or heavy, it may be nec-
essary to bevel the edges with an angle grinder. The
correct groove angle should be around 60 degrees.
a. Incorrect
b. Correct
(see fig. A on page 8)
Based on different welding position, there are differ-
ent welding joints:
Butt weld joints
a. Closed butt joint
b. Open butt joint
c. Single bevel joint
d. Double bevel joint
e. Single V-joint
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f. Double V-joint
(see fig. B on page 8)
Fillet weld joints
a. Single fillet lap joint
b. Double fillet lap joint
c. Single strap joint
d. Double strap joint
e. Single fillet T-joint
f. Double fillet T-joint
(see fig. C on page 8)
4. Earth clamp connection
Clear any dirt, rust, lime scale, oil or paint residues
on the ground clamp. Make certain you have a
good solid ground connection. A poor connection of
the ground clamp will waste power and heat. Make
sure the ground clamp touches the metal.
5. Setting the MIG wire tension
WARNING!
Arc flash can cause eyes injury! To reduce the
risk of arc flash, make certain that the wire coming out of
the end of the torch does not come in contact with work-
piece, ground clamp or any grounded material during
the drive tension setting process or arcing will occur.
5.1. Press the trigger on the torch.
5.2. Turn the drive tension adjustment knob clock-
wise, increasing the drive tension until the wire seems
to feed smoothly without slipping.
6. Gas installation
WARNING!
Shielding gas cylinders and high pressure cylinders
can explode if damaged, so treat them carefully!
- Never expose cylinders to high heat, sparks, open
flames, mechanical shocks or arcs.
- Do not touch cylinder with MIG gun.
- Do not weld on the cylinder.
- Always secure cylinder in the upright position to a
cart or stationary object.
- Keep cylinders away from welding or electrical circuits.
- Use the proper regulators, gas hose and fittings for
the specific application.
Whenever MIG (solid) wires are used, the shielding
gas is required.
6.1. Polarity changing
The factory polarity setting is for flux core welding
(no shielding gas is required). In this mode, the MIG
gun lead is connected to "-" (negative) polarity, and
ground cable end to "+" (positive) pole (see fig. D (a)
on page 8). If MIG welding with shielding gas, the
MIG gun lead should be connected to "+", and