Unitek UNIBOND 2, User Manual

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5.05. F i g u r e 1 4 shows t h e v o l t a g e and c u r r e n t waveforms obtained from welding gold
plated Kovar t o a n unplated copper t r a c e i n t h e Constant Vo l t a g e Mode u s i n g 35 o z
Electrode Force. . 0 1 0 i n c h Gap w i t h a Pulse Amplitude o f . 6 2 V w i t h a Duration o f ( a )
10 ms and ( b ) 3 7 ms. T h e r i p p l e on t h e v o l t a g e waveform, i n 1 4 ( a ) . a f t e r 6 ms i s
caused by m e l t i n g . T h e Current i n 1 4 ( b ) s t a r t e d a t 120 amps and decreased t o 6 0 amps
w i t h i n t h e f i r s t 1 5 ms a f t e r which t i m e i t remained constant. I t i s t h i s c h a r a c t e r i s -
t i c which makes t h e Constant Vo l t a g e Mode i d e a l f o r t h i s t y p e a p p l i c a t i o n .
'VOLTAGE
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t i l i P
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L
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VOLTAGE - . 5
- 120
- volts/cm
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CURRENT
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VOLTAGE
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-
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.5 v o l t s / c m
60 amps/cm
5 ms/cm
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DURATION
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VOLTAGE
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- . 5
- 1 2 0
- volts/cm
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/cm
— VOLTAGE
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CURRENT
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Figure 1 4 - Gold p l a t e d Kovar r i b b o n welded t o a n unplated 1 o z copper
trace i n t h e Constant Vo l t a g e Mode f o r ( a ) 1 0 ms and ( b ) 3 7 ms.
Figure 1 5 - Copper r i b b o n welded t o a n unplated 1 o z copper t r a c e
i n t h e Constant Vo l t a g e Mode f o r ( a ) 3 ms and ( b ) 4 ms.
5 . 0 6 . F i g u r e 1 5 ( a ) and ( b ) show t h e waveforms obtained from welding . 0 0 3 x . 0 1 0
inch unplated copper r i b b o n t o a n . 0 1 0 i n c h wide. 1 o z unplated copper t r a c e i n t h e
Constant Vo l t a g e Mode u s i n g Moly Unibond Electrodes. 3 5 o z Electrode Force and a . 0 1 2
inch Gap. T h e Amplitude and D u r a t i o n S e t t i n g s were 0 . 7 9 V and 3 ms. r e s p e c t i v e l y.
- 1 5 -