Clarke 250TE Dokumentacja Pobierz pdf (Strona 20)

9. Close the side panel of the machine, and switch on at the mains or isolator.

10. Set the Wire Feed rotary switch, on the front panel, to position 6 OR 7, switch on the

machine and press the trigger.

The wire will feed through the hose and when it appears at the torch end,

release the trigger, switch off the machine and disconnect from the mains

supply. Replace the contact tip and the torch shroud.

IMPORTANT:

Ensure the hose is kept straight during this operation, to assist the wire as it

is fed through to the wire liner and torch.

D. Selecting the Correct Drive Roller Groove

As previously mentioned, it is important that the correct groove in the drive roller is

selected for the particular wire being used. Two rollers are provided, one with 0.6

and 0.88mm grooves, and one with 1.0 and 1.2mm grooves.

The welder is factory set with the 0.8mm groove in position.

To change grooves, proceed as follows:

1. With the pressure roller bracket

raised, and the old wire removed,

remove the roller securing knob

(arrowed), by turning it fully

anticlockwise, then pull the roller

from the shaft.

2. Ensure the appropriate groove is

facing inwards, before sliding

the roller on to the shaft.

Screw on the securing knob, to

lock the roller securely in place.

Fig.10

OPERATION

MOST IMPORTANT!

It is VITAL that the workpiece is perfectly clean at the point of weld. Any coating,

plating or corrosion MUST be removed, otherwise a good weld will be impossible

to achieve.

C. Set The Controls

In order to produce a satisfactory weld, the controls must be fine tuned whenever

there is a material change in weld characteristics. This is generally referred to as

‘Tuning the Welder’.

The tuning of a Mig welding machine requires some practice, due to the fact

that - contrary to the arc welding procedure - two parameters must be

accommodated to achieve a perfect weld. These are:

(1) Welding Current, and (2) Wire Feed Speed,

It is important to arrive at the correct combination to suit the type and thickness

of material to be welded.

The CURRENT, necessary for welding, is directly related to the wire feed speed.

As the current is increased, the wire feed speed is also increased.

Conversely, if current is decreased the wire feed speed is decreased.

A change in wire diameter results in changed parameters. A smaller diameter

wire requires an increase in wire feed speed to reach the same current.

If certain limits are exceeded, a satisfactory weld cannot be obtained. These

are:

A) A too high wire feed speed (too high with regard to the welding current)

results in pulsing within the torch. This is because the wire electrode dips into

the puddle and cannot be melted off fast enough.

B) If the welding current is set too high, large drops can be seen at the end of

the wire electrode. These drops are often deposited beside the welding seam.

The correct rate of wire feed speed and welding current, results in very little

spatter and a continuous, intensive hissing can be heard from the arc.

Each time you use the machine, it will be necessary to perform the following

operations:

A. Check The Welding Wire

B. Prepare The Work

Check to ensure the correct type of welding wire is installed for the job in hand,

and is correctly adjusted.

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