Cigweld Transmig 4RT handleiding

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TRANSMIG 4RT BASIC WELDING

BASIC WELDING 4-4 Manual 0-5245

Electrode Wire Size Selection

The choice of Electrode wire size and shielding gas used depends on the following

• Thicknessofthemetaltobewelded

• Typeofjoint

• CapacityofthewirefeedunitandPowerSource

• Theamountofpenetrationrequired

• Thedepositionraterequired

• Thebeadproledesired

• Thepositionofwelding

• Costofthewire

4.02 MIG (GMAW/FCAW) Welding Troubleshooting

Solving Problems Beyond the Welding Terminals

The general approach to fix Gas Metal Arc Welding (GMAW) problems is to start at the wire spool then work through

to the MIG Torch. There are two main areas where problems occur with GMAW; Porosity and Inconsistent wire feed.

Problem 1 - Porosity

When there is a gas problem the result is usually porosity within the weld metal. Porosity always stems from some

contaminant within the molten weld pool which is in the process of escaping during solidification of the molten metal.

Contaminants range from no gas around the welding arc to dirt on the work piece surface. Porosity can be reduced

by checking the following points.

FAULT CAUSE

1

Shielding gas cylinder contents and flow

meter.

Ensure that the shielding gas cylinder is not empty and the flow meter is

correctly adjusted to 15 litres per minute.

2

Gas leaks. Check for gas leaks between the regulator/cylinder connection and in the gas

hose to the Power Source.

3

Internal gas hose in the Power Source. Ensure the hose from the solenoid valve to the MIG Torch adaptor has not

fractured and that it is connected to the MIG Torch adaptor.

4

Welding in a windy environment. Shield the weld area from the wind or increase the gas flow.

5

Welding dirty, oily, painted, oxidized or

greasy plate.

Clean contaminates off the work piece.

6

Distance between the MIG Torch nozzle

and the work piece.

Keep the distance between the MIG Torch nozzle and the work piece to a

minimum.

7

Maintain the MIG Torch in good working

order.

A

Ensure that the gas holes are not blocked and gas is exiting out of the torch

nozzle.

B

Do not restrict gas flow by allowing spatter to build up inside the MIG Torch

nozzle.

C

Check that the MIG Torch O-rings are not damaged.

Table 4-1: MIG (GMAW / FCAW) Welding Troubleshooting

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