Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Ed Holton

#16072

High temperature soldering | 24 April, 1998

Looking for anyone who has experience with high temperature soldering. Need to determine why solder joints are failing. Thermocycling of unit is -40C to +140C, 30 minute dwell time, 10 sec. transition time Your help is appreciated Ed Holton Hella Electronics 734-414-0944

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Earl Moon

#16074

Re: High temperature soldering | 24 April, 1998

| Looking for anyone who has experience with high temperature soldering. Need to determine why solder joints are failing. Thermocycling of unit is -40C to +140C, 30 minute dwell time, 10 sec. transition time | Your help is appreciated | Ed Holton | Hella Electronics | 734-414-0944

Ed, You've obviously been through this before. May I ask the solder medium, solder temp, solder surface coating or plating, solder process control, etc.? Earl Moon

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D.Lange

#16073

Re: High temperature soldering | 24 April, 1998

| Looking for anyone who has experience with high temperature soldering. Need to determine why solder joints are failing. Thermocycling of unit is -40C to +140C, 30 minute dwell time, 10 sec. transition time | Your help is appreciated | Ed Holton | Hella Electronics | 734-414-0944 Maybe the standards you are trying to conform to were designed for plated thru hole assemblies and not smt at all (no leads to absorb thermal expansion).� If you just happen to be soldering surface mount assemblies� like I was sn62/pb36 /ag2 Then temp cycling would cause significant compression and tension to the solder joints and the component as well. In my case the component failed where the solder joint remained sound.� If you are performing such temperature cycling on surface mount components such as chip cap/resistors then you are testing your product to death or near death and it will never survive the real world.�� First ask yourself is this cycling truly required! In my case it wasnt...customer just assumed it was for all assemblies pth and smt.

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