Telwin TECHNOMIG 225 PULSE Инструкция по эксплуатации онлайн [8/84] 413799

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spool gun button and wait for the end of the wire to pass completely - welding voltage range : 24-30V

through the wire guide hose and for 10-15 cm to come out of the - suitable gases : Ar 99.9%

front of the torch, release the torch button. The contact tip should generally be 5-10mm inside the nozzle, the

higher the arc voltage the further inside; the length of free wire (stick-

REPLACING THE LINER IN THE TORCH (FIG. I)

out) should normally be between 10 and 12mm.

Before proceeding to replace the hose, lay out the torch cable straight

In MANUAL MODE (“PRG 0”), once the wire feed rate and arc voltage

without any bends.

2- Unscrew the hose locking nut on the central connector and remove

heat transfer).

the old hose.

3- Insert the new hose into the cable-torch duct and push it gently

WIRE WELDING

until it comes out of the torch head.

PULSE ARC TRANSFER MODE (WHERE PROVIDED)

4- Tighten up the hose locking nut by hand.

This is a “controlled” transfer situated in the “spray arc” transfer area

5- Trim off all the excess protruding hose pressing it slightly; remove it

Every current impulse corresponds to the separation of a single drop

7- Tighten up the nut again using a spanner.

from the wire electrode; the phenomenon occurs with a frequency that

8- Reassemble the contact tip and nozzle.

is proportional to the wire feed rate with the variation rule related to the

type and diameter of the wire itself (typical frequency values: 30-

Synthetic hose for aluminium wires

300Hz).

Carry out operations 1, 2, 3 as given for the steel hose (ignore

Carbon and mild steels

10-At the other end of the hose (torch connector end) insert the brass

- Suitable gases : mix Ar/CO , Ar/CO /O (Co max 20%)

2 2 2 2

nipple and the OR ring and, keeping slight pressure on the hose,

Stainless steels

tighten the hose locking nut.

- Suitable wire diameter: 0.8-1.2mm

The excess part of the hose will be removed to size later on (see

- Welding current range: 50-230A

(13)).

11-THE CAPILLARY PIPE IS NOT REQUIRED for aluminium hoses of

- Suitable wire diameter: 0.8-1.6mm

diameter 1.6-2.4mm (coloured yellow); the hose is therefore

- Welding current range: 40-320A

inserted into the torch connector without it.

- welding voltage range : 17-28V

Cut the capillary pipe for aluminium hoses of diameter 1-1.2mm

- suitable gases : Ar 99.9%

(coloured red) to approx. 2mm shorter than the steel pipe, and

Normally the contact pipe should be 5-10mm inside the nozzle, the

Application: “horizontal” welding on medium-low thicknesses and on

Reassemble the torch in the wire feeder connector and assemble

heat-sensitive materials, particularly suitable for welding light

the gas nozzle

alloys (aluminium and its alloys) also on thicknesses below 3mm.

6. WIRE WELDING

Short arc

ADJUSTING THE WELDING PARAMETERS

The melting of the electrode wire and the detachment of the drop is

Shielding gas

- Suitable wire diameter: 0.6-1.2mm

Welding current

- Welding current range: 40-210A

Is determined for a given wire diameter by its own advancement speed.

- Arc voltage range: 13-23V

Remember that for a given current the wire advancement speed is

- Suitable gases: CO , mix Ar/CO , Ar/CO /O

2 2 2 2

inversely proportional to the diameter used.

Stainless steels

- Suitable gases: mix Ar/O , Ar/CO (1-2%)

Arc voltage can be adjusted by the operator by turning the encoder

2 2

Aluminium and alloys

knob (FIG.C (5)); it adjusts itself to the chosen wire feed rate (current)

- Suitable wire diameter: 0.8-1.6mm

according to the diameter of the wire being used and the type of

- Welding current range: 75-160A

protective gas, progressively according to the following relationship,

- Arc voltage range: 16-22V

Generally, the contact tip should be flush with the nozzle or protrude

slightly when using the thinnest wires and lowest arc voltages; the

length of free wire (stick-out) will normally be between 5 and 12mm.

Weld quality

The quality of the weld seam is higher when less spatter is produced.

Application: Welding in all positions, on thin material or for the first

this is determined principally by a correct balance of the welding

(FIG. L) in order to avoid excessive spatter and faults on the weld

be used with great care (especially with wires of diameter >1mm)

seam. The weld speed (i.e. the advancement speed along the joint) is

because the risk of melting defects may arise.

also a determining factor for the correct execution of the seam. This is

particularly important for good penetration and correct shape of the

WIRE WELDING

seam.

SPRAY ARC TRANSFER MODE

The most common welding flaws are summarized in TAB.8.