Mig Welding; Preparation For Welding; Welding Procedures; Saldatura - Helvi READY MIG 100 Manual De Uso

(no burrs or angles) and at least 5cm of the end is straight (no curves). Failure to follow these instructions could lead to the
wire damaging the liner.
5. Lower the upper roll (N) and the knob (L) and tighten slightly (if there is too much pressure the wire gets locked and
the motor could get damaged, if too loose the wire will not be fed by the rolls).
6. Connect the power supply cable to the 230V 50Hz line and turn on the switch, then press the torch switch. The wire
fed by the wire feeding motor at variable speed must slide through the liner; when it exits from the torch neck, release
the torch switch, turn off the machine and mount the contact tip and the nozzle.
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WARNING: The rolls, when in movement, may crush the fi ngers. Periodically check the rolls and replace them when
they are worn and compromise the regular feeding of the wire.
WARNING: The torch is the part of the equipment that needs most maintenance. We recommend to check periodically the
contact tips and the nozzle, these parts must be clean and not worn-out. The torch liner must be replaced when the wire
does not run smoothly.

5.0 MIG WELDING

In MIG welding (Metal Inert Gas) a continuously fed metal electrode is melted into a welding pool at constant and
controlled speed.The wire is connected to a constant voltage pole while the workpiece is connected to the other pole.
When the wire is fed and touches the workpiece, an electric arc is produced. The arc melts the wire that is deposited on
the workpiece.
6.0 NO GAS WELDING
By gas welding the shielding gas is used to protect the weld pool from oxidation and porosity. By NO GAS welding this
protection is given by a special wire called "fl ux cored wire", this technique simplifi es the use of these machines compared
to the machines with standard wire, on which the gas fl ow must be adjusted separately.

7.0 PREPARATION FOR WELDING

1.Connect the welding machine to the 230V 50/60Hz line;
2.Connect the ground cable to the workpiece and make sure that the contact is good;
3.Make sure that the wire-feeding roll is correctly positioned (groove matching the wire diameter). Note that each roll has
two grooves one marked by 0.9mm and the other marked by 0.7mm.
8.0 ADVANTAGES OF NO GAS WELDING
1.There is no need for gas cylinders.
2.Welding outdoors is easier because there are fewer chances that wind blows away the shielding gas.
3.Welding time is about 50% less compared to the normal electrode welding.
4.The learning time for the operator is very short.
5.Minimum waste of welding material.
6.Most important, this process allows to complete the welding more quickly and effi ciently.
7.Less heat, less distortion.
8.Possibility to weld thin materials.

9.0 WELDING PROCEDURES

1.Your welding power source has 2 positions for the regulation of the current in the various conditions.
2.The choice of the position for the welding is determined by the thickness of the material to weld.
3.For the adjustment of the power source make reference to the graphs and of the following pages.
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