Weldmatic 175 [internal wirefeeder] - BJH

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Operators Manual6 Normal Welding SequenceWeld StartClosing the welding gun switch initiates thissequence of events:• The gas valve is energised and gas flowcommences;• The power source contactor is initiated.Welding voltage is applied between thework piece and the consumable wire.• The wire drive motor is energised.• The wire touches the work piece, and thearc is established.Weld EndReleasing the gun switch initiates thissequence of events:• The wire drive motor is de-energised, andis dynamically braked to a stop;• The welding transformor is de-energisedand welding current stops.• The gas valve is de-energised and theflow of shielding gas ceases.7 Basic Welding InformationChoice of Shielding GasThe choice of shielding gas is largelydetermined by the consumable wire tobe used. Many proprietary shielding gasmixtures are available.The recommended shielding gases for usewith the Weldmatic 175 are:• Mild Steel Argon +5 to 25% CarbonDioxide;• Aluminium Argon;• Stainless Steel Argon + 1 to 2%Oxygen.Consult your gas supplier if more specificinformation is required.Shielding Gas Flow RateIn G.M.A. welding, one function of theshielding gas is to protect the molten weldpool from the effects of oxygen in theatmosphere. Without this protection theweld deposit becomes ‘honeycombed’ inappearance, an effect which is described asweld porosity.In draft-free conditions the gas flow raterequired to give adequate protection istypically 10-12 litres/min. In situations wheredrafts cannot be avoided, it may be necessaryto increase this rate up to 20 litres/min, and/or to provide screening of the work area.Weld porosity can also be caused by airentering the gas stream through a damagedhose, loose gas connection, or fromrestriction in the nozzle, such as from excessbuild-up of spatter.When welding aluminium, particular caremust be taken with all aspects of shieldinggas delivery and workpiece preparation inorder to avoid weld porosity.10Quality • Reliability • Performance
Weldmatic 175Weldmatic 175Settings ChartFig 4 Weld Setting ChartsModel No CP122, Iss A 07/07 11
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Weldmatic 175 [internal wirefeeder] - BJH

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