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February 10, 2012
Epoxy Bonding Problems on RoHS Boards
Ultrasonic Cleaning Causing Damage
Solder Deposits During Wave Soldering
Problems Hand Soldering 24 Layer Board
Component Damage From IR Reflow
Organic Flux Residue Concerns
Alternatives to Conformal Coating
Does Lead-free Flux Make a Difference?
Cause of Unusual Contamination?
Wave Soldering Problems
Is Pre-Bake Required Prior to Rework?
BGA Replacement Limit
Recovering Solder from Dross
What Causes Oxidation on SMT Pads?
Plating Lead-free Parts for Tin/Lead Assembly
Hand Soldering vs. Selective Wave
Problems with Blow Holes
Cleaning No-Clean Solder Paste
Soldering Lead-free with Tin-lead Solder
Can You Rework Circuits Under a BGA
Effects of Ultrasonic Cleaning
Problems with Bubbles in Conformal Coating
Reworked BGA Bridging at the Corners
Problems with Insufficient Barrel Fill
Delamination Dilemma
Mysterious Solder Balls
Contamination Prior to Conformal Coating
Is Baking Required After Aqueous Cleaning?
Which to Use - Rosin Flux or Water Soluble?
Hard Water Contamination
SMT Component Shift
BGA Shifting During Reflow
Solder Joint Explosions
No Clean Flux Stains
What Is the Life Span for a Profile Board?
Recommended Lead to Hole Ratio
Flux Residue Visible After 3 Months
Solvent Attacking Flex Circuits
Reworking Circuits Under a BGA Component
Cleaning to Remove Solder Balls
Total: 182    Page 1 of 19 
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Epoxy Bonding Problems on RoHS Boards
We are having problems with epoxy bonding to RoHS boards. Is there something about RoHS boards that make them more difficult to bond?
Channel: Adhesives, Coating, Dispensing
Ultrasonic Cleaning Causing Damage
What method can be used to prevent damage to sensitive SMT components during the ultrasonic cleaning process?
Channel: Cleaning, Washing, Solvents
Solder Deposits During Wave Soldering
During wave soldering, is there a possibility for solder to deposit on SMT components or cause a solder bridge between component pins?
Channel: Soldering, Selective, Wave
Problems Hand Soldering 24 Layer Board
We are assembling a back plane board with 24 layers. We are finding that the solder does not flow through to the other side of the board.
Channel: Soldering, Selective, Wave
Component Damage From IR Reflow
We have an SMT package with J formed leads that crack at the shoulder after IR reflow. What could be causing these defects?
Channel: Reflow Soldering, Profiling
Organic Flux Residue Concerns
What concerns should we have with reliability if we skip cleaning after rework? Our processes will leave organic flux residues on our boards.
Channel: Cleaning, Washing, Solvents
Alternatives to Conformal Coating
What are conformal coating alternatives to insulate solder joints and exposed conductors from condensing moisture?
Channel: Adhesives, Coating, Dispensing
Does Lead-free Flux Make a Difference?
Does using a lead-free solder flux really make a difference? Why not use the same flux we use for leaded soldering?
Channel: Solders, Fluxes, Pastes
Cause of Unusual Contamination?
We have 40 PCB assemblies with unusual contamination. Do you have any ideas what the contamination is, and what caused it?
Channel: Contamination, Defects, Whiskers
Wave Soldering Problems
We are seeing many process defects that occur after wave soldering operations. Can you provide suggestions?
Channel: Soldering, Selective, Wave
Total: 182    Page 1 of 19 
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