
3
Thecompleterangeofthecapacitordischargeequipmentiscompact,portablestud
weldingequipment.Theunitsarespecificallydesignedtoenableasmalldiameter
rangeofferrousandnonferrousweldstudstobeweldedtolightgaugemetalmateri‐
alswithlittleornoreverse‐sidemarking.
Theequipmentconsistsofacontrolunit,aweldinghandgun,andallnecessaryinter‐
connectingcables.
THEPROCESS
CapacitorDischarge(CD)studweldingisaformofweldinginwhichtheenergyre‐
quiredfortheweldingprocessisderivedfromabankofchargedcapacitors.This
storedenergyisdischargedatthebaseofthespeciallydesignedCDstudanditfuses
thestudtothebasematerial.Thetimeoftheweldisdeterminedinsuchashortdu‐
rationthatnoburnthroughmarkingismadeonthefinishsideofthematerial.
CONTACT
IncontactCDwelding,thestudisplacedunderspringpressureonthematerialtobe
welded.Whenthecapacitorsaredischarged,thespecialtipoftheCDstudmeltsand
thespringpressureforcesthestudtofusewiththebasematerial.
GAP
IngapCDwelding,thestudisplacedontothematerialtobewelded.Asthestudgun
isengaged,thestudliftsfromthebasematerialandthenreturnstothepointofcon‐
tactatthetimeofthedischargeofthecapacitors.Asthecapacitorsdischarge,melt‐
ingthetipoftheweldstud,thepressurecreatedbythemovementofthestudtothe
basematerialbythestudgunfusesthestudtothebasematerial.
INTRODUCTION