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WEST•BOND MODEL 454647E SER IES INSTRUCTION MANUAL 99 TROUBLESHOOTING Poor Bond Quality The following are possible causes for poor bond quality. Poor bond q uality could either mean a bond does not meet visual criteria, …
WEST•BOND MODEL 454647E SERIES INSTRUCTION MANUAL
98
ADVANCED PROGRAMMING
Nudge Up
This option is used to increase loop height. Just before making the second bond, the machine can be set to “walk”
back toward the first bond while at search above the second bond. This effectively nudges up the loop height. To
work effectively, the search above second bond should be set fairly low to the work.
NUDGE-UP before Bond #2: 0 Y step
4=Key in 5=Increase (0.00000”)
7=Prev bond 8=Suggest 9=Next bond
A=Prev option 0=Decrease G=OK
ϑ To call “Nudge-Up”
From the H
OME menu press 4 (EDIT), 0 (EDIT LOOP MOTION), 4 (LOOP EDIT), and then
press G (NUDGE-UP).
Key Format:
Escape
1
Go To
Device
2
Home
3
Key In
4
Increase
5
6
Previous
Bond
7
Suggest
8
Next
Bond
9
Previous
Option
A
Decrease
0
Next
Option
G
WEST•BOND MODEL 454647E SERIES INSTRUCTION MANUAL
99
TROUBLESHOOTING
Poor Bond Quality
The following are possible causes for poor bond quality. Poor bond quality could either mean a bond
does not meet visual criteria, does not adhere to bonding surface, or produce unacceptable bond pull
tests.
There are six key areas where the problem may be found causing poor bond quality.
1. Tool
a. Position
b. Clamping Force, Set Screw Torque
c. Characteristics / Geometry of Tool / Condition of Tool
d. Condition of Bonding Surface
e. Bonding Surface Area
2. Workholder
a. Temperature / Stability
b. Heat Transfer
c. Rigidity
d. Environment
e. Positioning Accuracy
3. Wire
a. Size
b. Type
c. Breaking Load
d. Elongation
e. Age / Condition / Quality
f. Uniformity / Twist / Curl
4. Bonded Wire
a. Wire / Tool Interface
b. Optimized Bonding Schedule
c. Location
d. Wire Curl
e. Intermetallics
f. Time / Temperature Environment
g. Bond Interface Condition
h. Ergonomics
5. Bonding Surface
a. Metal Purity
b. Metal Uniformity
c. Metal Thickness
d. Surface Contamination
e. Surface Texture
f. Metal Bondability, Initial and after Time/Temp.
6. Bonder
a. Mechanical / Electrical Calibration of Machine
b. Optimized Bonding Schedule
i. Ultrasonic Energy
ii. Ultrasonic Time
iii. Bond Pressure
iv. Temperature
c. Operator Skill
d. Ergonomics
WEST•BOND MODEL 454647E SERIES INSTRUCTION MANUAL
100
TROUBLESHOOTING
Inconsistent Looping
The 454647E’s 45° Tooling Head configuration offers excellent looping control. The bonding wires natural
characteristics and tendencies are to resist and sometimes refuse to bends or form a loop in a desired
fashion. Please refer to the following list for consideration to solve any experience with inconsistent loop
control on your application.
1. “Loop Height” Profile is too low.
2. Insufficient “Backbend” during looping.
3. Insufficient “Z-Before-Y” during looping.
4. Excessive “Loop Pull” during looping.
5. Clamps remain open while descending to the 2
nd
Bond.
6. Bonding tool feed through hole is excessive for wire diameter.
7. Bonding tool feed through hole angle is not applicable for this application.
(Generally, a 45° feed through hole is recommended.)
8. Clamps are not centered properly with Bonding Tool.
9. Force Calibration need to be verified.
10. Using of aged or damaged wire.