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Does pot temperature affects quality of the solder joints?

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#77007

Does pot temperature affects quality of the solder joints? | 2 February, 2017

Hello all,

I was just wondering if solder pot temperature affects the quality or the life of the solder joints? For example we run 100Sn at 275C. If I bump it up to 300C, what is that going to change?

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#77008

Does pot temperature affects quality of the solder joints? | 2 February, 2017

Maybe increased barrel fill? Raising pot temps slightly seems to increase barrel fill at selective solder, something we battle with.

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#77014

Does pot temperature affects quality of the solder joints? | 2 February, 2017

I'd expect pot temperature to affect components and bare board performance before affecting the solder connection

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#77018

Does pot temperature affects quality of the solder joints? | 3 February, 2017

It makes sense. With temperature viscosity will change, and more liquidus material will flow better.

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#77019

Does pot temperature affects quality of the solder joints? | 3 February, 2017

Dave, what do you mean affect the board? Any literature on the subject here in the forum or any at all?

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#77024

Does pot temperature affects quality of the solder joints? | 3 February, 2017

Is this for a Selective Solder? If so what size nozzle do you run. I run at 315 C most of the time. You can speed up your process time and still achieve good solder fill.

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#77043

Does pot temperature affects quality of the solder joints? | 6 February, 2017

I was actually thinking about the wave soldering machine.

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#77049

Does pot temperature affects quality of the solder joints? | 6 February, 2017

Evtimov: IDEALS Project was one of the first to talk about componebt and board damage caused by LF soldering temperatures. There's lots of more current stuff on the web. Here's some that may help: * Assessment of Long-term Reliability in Lead-free Assemblies [http://www.calce.umd.edu/TSFA/study_on_tin_pest.pdf] * An Assessment of the Impact of Lead-Free Assembly Processes on Base Material and PCB Reliability [http://www.isola-group.com/wp-content/uploads/2011/12/assessmentLeadFree.pdf] * Component Level Reliability for High Temperature Power Computing with SAC305 and Alternative High Reliability Solders [https://www.researchgate.net/publication/282860475_Component_Level_Reliability_for_High_Temperature_Power_Computing_with_SAC305_and_Alternative_High_Reliability_Solders]

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David

#77051

Does pot temperature affects quality of the solder joints? | 6 February, 2017

No matter in selective soldering or wave soldering process, higher pot temperature and longer wetting time can increase IMC thickness and joint strength(reliability), but as Daivf said, you need to care if the DIP component and bare PCB was damaged by higher temperature. I have several failure experience when I make DOE to find out the best machine setting parameter in NPI stage.

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#77068

Does pot temperature affects quality of the solder joints? | 8 February, 2017

Thank you all for the feedback. DaveF, thank you for the articles.

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#77148

Does pot temperature affects quality of the solder joints? | 24 February, 2017

Selective Soldering Frames can pull large amounts of heat from the solder wave at the point of contact, effectively lowering the temperature of the solder at the solder joint. You should confirm the temperature of the solder joints by running a thermal profile. Once the solder joint temperatures are measured and understood, you can determine if temperature is one of the causes of the cold solder joints. In my experience, cold solder joints were manually created, due to insufficient flux, insufficient heat and insufficient time to create the solder joint.

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