Kemppi MMT 42C Manual do Utilizador descarregar pdf (Página 12)

4. OPERATION DISTURBANCES

Welding performance can be eected by a number of issues, including the welding gun and/

or other parts of the welding system. The following information will help you to check, identify

and rectify possible causes of welding malfunction.

NOTE! The problems listed and the possible causes are not denitive, but serve to suggest some

standard and typical situations that may present during normal use when using the MIG/MAG

process.

Dirty, poor quality weld?

• Checkthatspatterisnotblockingthenozzleorcontacttipadapter

• Checkshieldinggassupply•

• Checkandsetgasowrate•

• Checkgastypeforapplication•

• Checkgunpolarity.Example:Fesolidllerwire:Earthreturnsocketshouldbeconnectedtothe-pole,wirefeed/Gun

connectiontothe+pole

• Checkpowersupply-Phasedown?

Variable welding performance?

• Checkwirefeedmechanismiscorrectlyadjusted

• Checkcorrectdriverollsaretted

• Checkwirespool/huboverruntensioniscorrectlyadjusted

• Checkgunlinerisnotblocked.Replaceifnecessary

• Checkcorrectgunlineristtedforthellerwiresizeandtype

• Checkcontacttipforsize,typeandwear

• Checkgunisnotoverheatingfortheapplication

• Checkcableconnectionsandearthreturnclamp

• Checkweldingparametersettings.

Filler wire won’t feed?

• Checkwirefeedmechanism.Adjustasnecessary

• Checkweldinggunswitchfunction.

• Checkeurogunconnectoriscorrectlytted

• Checkgunlinerisnotblocked

• Checkcontacttip,size,type,wear

• Checkllerwirediameterforcorrectsize

High spatter volume?

• Checkweldingparametervalues

• Checkinductance/Dynamicsvalues

• Checkgastypeandow

• Checkweldingpolarityandcableconnections

• Checkllermaterialselection

• Checkllerwiredeliverysystem

• Checkpowersupply.Areallelectricalphasespresent?

• Checkthatoperatormaintainscorrecttechnique/Arclength/travelspeed/Gunangle

NOTE! Many of these checks may be carried out by the operator. However certain checks relating to

mains power must be completed by an authorised trained electrician.

MMT 42C

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