CONTACT ^VKLDl\(i 1 X WIK'K SI'IM\(! HKLAYS 



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liiu> used I'oi' twin wire coinh inainit'acluic. 'riicsc lines, hy bcin*; fully 

 autonialir in operation, arc iiitcrcsl in^ examples of auton\alion. 



UKASONS FOU SELIOCTION OF PERCUSSION WELDING 



Percussion \v(^l(lini>; was selected for tliis proc(\ss for tiie followius 

 reasons: 



1. 'Hie electrodes may be placed well away from tlie weld zone. The 

 lesser cuirent lequired for arc wielding as compared to resistance welding 

 makes it possible to conduct this current through the wires without heat- 

 ing them appreciably. The electrodes must be placed away from the wire 

 ends so the clamping force will not deflect the wires from their normal 

 position, thus causing a misalignmerit of contact surfaces. 



2. A suitable heat balance in the weld zone can be obtained readily. 

 If the slower butt wielding method were used this would be more difficult 

 because of the unequal size and differing electrical and heat conductivi- 

 ties of the abutting parts. 



Fig. 11 — Percussion welder lui (unutcio on siugle-vviie cum 



