Use With Cored Wire (Optional); Use With Wire And Protective Gas For Welding Mild Steel; Welding Aluminium; Welding Stainless Steel - Air Liquide FRO PRACTIC 191/2 User Manual

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6.0 USE WITH CORED WIRE (OPTIONAL)

Your welder can use special Ø 0.9 flux cored wire that
does not require protective gas. This wire, contrary to the
case with electrodes, does not leave slag and gives better
bead penetration with substantially lower line absorption.
Make sure you use proper welding polarity:
"POLARITY CHANGEOVER"
FIGURE 2.
6.1 USE WITH WIRE AND PROTECTIVE GAS FOR
WELDING MILD STEEL.
"POLARITY CHANGEOVER"
FIGURE 3.
Either CO2 or Argon /CO2 (Mix) can be used as protective
gases.
6.2

WELDING ALUMINIUM

Set the welder up for welding mild steel, with the
following variations:
1. Use the cylinder containing pure Argon.
2. Mount a reel of Ø 0.8 mm aluminium wire.
3. Mount the Ø1 mm contact spout.
6.3

WELDING STAINLESS STEEL

Set the welder up for welding mild steel, with the
following variations:
24
USE WITH CORED WIRE (OPTIONAL)
NO GAS
GAS
1. Use the cylinder containing Argon/CO2.
Mount a reel of max. Ø 0.8 mm stainless steel wire.
7.0 BASIC INFORMATION REGARDING MIG

WELDING

- MIG WELDING PRINCIPLES
MIG welding is autogenous, i.e. it permits welding
of pieces made of the same metal (mild steel,
stainless steel, aluminium) by fusion, while gran-
ting both physical and mechanical continuity.
The heat required for melting is generated by an
electric arc that strikes between the wire
(electrode) and the piece to be welded.
A shield gas protects both the arc and the molten
metal from the atmosphere.
8.0 CONNECTION AND PREPARATION OF
EQUIPMENT FOR WELDING
Connect welding accessories carefully to avoid power
loss or leakage of dangerous gases.
Carefully follow the safety standards described in
chapter 1.0.
Check gas outlet; turn gas cylinder knob to regulate flow.
CAUTION: Screen gas flow when operating in outdoor or
ventilated sites; welding operations may not be protected
due to dispersion of inert shielding gases.
8.1 WELDING
1. Open the gas valve of the regulator and set a
flow, depending on the welding position chosen.
Fix the earth clamp to the piece to be welded in a
point free of rust, plastic and paint
2. Select the welding current (Ref.2 e 3 - Fig. 1 pag.
23) ; bear in mind that the thicker the material,
the greater the power required. The first posi-
tions on the switch are suitable for welding less
thick material.
Remember also that each position has its own
wire speed, which can be selected using the wire
feed knob (Ref.7 - Fig. 1 pag. 23) .
For best welding results, hold the torch and follow the
direction shown in the figure.
.