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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


high temperature solder alloy

Carol Zhang

#9107

high temperature solder alloy | 7 October, 1999

I have a board, 4 spacers needed to be soldered on the board first with the normal 62Sn37Pb alloy. Then, capacitors are manually soldered on the boards. The density of the board is quite high. If we wave soldered capacitors first, there will be no place for iron to manually solder the spacers. So, in order to wave solder capacitors, can I use some high temperature solder alloy, like 75Pb25In. Is there anyone have experience on using this type of solder alloy? or there is some better solder to do the job? Welcom to any opinion and thank you for your help.

Carol.

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Carol Zhang

#9108

Re: high temperature solder alloy | 7 October, 1999

| I have a board, 4 spacers needed to be soldered on the board | first with the normal 62Sn37Pb alloy. Then, capacitors are manually soldered on the boards. The density of the board is quite high. If we wave soldered capacitors first, there will be | no place for iron to manually solder the spacers. | So, in order to wave solder capacitors, can I use some high temperature solder alloy, like 75Pb25In. Is there anyone have experience on using this type of solder alloy? or there is some | better solder to do the job? | Welcom to any opinion and thank you for your help. | | Carol. | Sorry, I forgot to tell you, the spacers are made of brass. thank you again

carol

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Glenn Robertson

#9109

Re: high temperature solder alloy | 7 October, 1999

| | I have a board, 4 spacers needed to be soldered on the board | | first with the normal 62Sn37Pb alloy. Then, capacitors are manually soldered on the boards. The density of the board is quite high. If we wave soldered capacitors first, there will be | | no place for iron to manually solder the spacers. | | So, in order to wave solder capacitors, can I use some high temperature solder alloy, like 75Pb25In. Is there anyone have experience on using this type of solder alloy? or there is some | | better solder to do the job? | | Welcom to any opinion and thank you for your help. | | | | Carol. | | | Sorry, I forgot to tell you, the spacers are made of brass. | thank you again | | carol | Carol -

If I understand your plan, you want to use this solder in a wave soldering system. I know that wave soldering has been done with the Sn/Ag eutectic alloy (I forget the ratio) that melts at 221C, as I recall. Many alloys are being researched for Lead-free requirements, and most have a higher melting point that Sn/Pb. Try calling some of the major solder companies like Alpha, Multicore, and Kester. AIM also has a lead-free wave solder alloy. I hope this will help.

Glenn Robertson

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Carol Zhang

#9110

Re: high temperature solder alloy | 8 October, 1999

| | | I have a board, 4 spacers needed to be soldered on the board | | | first with the normal 62Sn37Pb alloy. Then, capacitors are manually soldered on the boards. The density of the board is quite high. If we wave soldered capacitors first, there will be | | | no place for iron to manually solder the spacers. | | | So, in order to wave solder capacitors, can I use some high temperature solder alloy, like 75Pb25In. Is there anyone have experience on using this type of solder alloy? or there is some | | | better solder to do the job? | | | Welcom to any opinion and thank you for your help. | | | | | | Carol. | | | | | Sorry, I forgot to tell you, the spacers are made of brass. | | thank you again | | | | carol | | | Carol - | | If I understand your plan, you want to use this solder in a wave soldering system. I know that wave soldering has been done with the Sn/Ag eutectic alloy (I forget the ratio) that melts at 221C, as I recall. | Many alloys are being researched for Lead-free requirements, and most have a higher melting point that Sn/Pb. Try calling some of the major solder companies like Alpha, Multicore, and Kester. AIM also has a lead-free wave solder alloy. | I hope this will help. | | Glenn Robertson

Thank you, Glenn. My plan is to use high temperature solder to hand soldering the spacers on the board first. Then, wave solder the rest components on the board. So, the solder on the spacers would not melt during wave soldering. Is it a practical idea?

Carol |

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Glenn Robertson

#9111

Re: high temperature solder alloy | 8 October, 1999

| | | | I have a board, 4 spacers needed to be soldered on the board | | | | first with the normal 62Sn37Pb alloy. Then, capacitors are manually soldered on the boards. The density of the board is quite high. If we wave soldered capacitors first, there will be | | | | no place for iron to manually solder the spacers. | | | | So, in order to wave solder capacitors, can I use some high temperature solder alloy, like 75Pb25In. Is there anyone have experience on using this type of solder alloy? or there is some | | | | better solder to do the job? | | | | Welcom to any opinion and thank you for your help. | | | | | | | | Carol. | | | | | | | Sorry, I forgot to tell you, the spacers are made of brass. | | | thank you again | | | | | | carol | | | | | Carol - | | | | If I understand your plan, you want to use this solder in a wave soldering system. I know that wave soldering has been done with the Sn/Ag eutectic alloy (I forget the ratio) that melts at 221C, as I recall. | | Many alloys are being researched for Lead-free requirements, and most have a higher melting point that Sn/Pb. Try calling some of the major solder companies like Alpha, Multicore, and Kester. AIM also has a lead-free wave solder alloy. | | I hope this will help. | | | | Glenn Robertson | | Thank you, Glenn. My plan is to use high temperature solder to | hand soldering the spacers on the board first. Then, wave solder the rest components on the board. So, the solder on the spacers | would not melt during wave soldering. Is it a practical idea? | | Carol | | | | Carol -

Your idea should work in principle, but I don't have much personal experience with higher-temp solders so I can only suggest some things to consider. Maybe someone else will have more suggestions. Obviously, the melting point must be higher than your wave solder temperature, which is probably about 250C. Use of a high-temp solder will place more stress on the boards, so heat damage may be a problem. You want to consider the usual tricks such as pre-heating the board, and going to a more heat-resistant laminate (higher Tg) if possible. You might also try using a hot gas repair station rather than a soldering iron. As for the alloy, I have to go back to suggesting that you contact the large solder suppliers for advice and samples. I happen to have some high-temp solder from Multicore that we sometimes use to attach thermocouples. Be aware that other alloys have different wetting properties and also may require a special flux. Good luck.

Glenn Robertson

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#9112

Re: high temperature solder alloy | 8 October, 1999

| I have a board, 4 spacers needed to be soldered on the board | first with the normal 62Sn37Pb alloy. Then, capacitors are manually soldered on the boards. The density of the board is quite high. If we wave soldered capacitors first, there will be | no place for iron to manually solder the spacers. | So, in order to wave solder capacitors, can I use some high temperature solder alloy, like 75Pb25In. Is there anyone have experience on using this type of solder alloy? or there is some | better solder to do the job? | Welcom to any opinion and thank you for your help. | | Carol. | So Carol, why don't you use a dab of glue to hold these spacers in place, until you wave solder them with the chip components? My2� Dave F

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Carol Zhang

#9113

Re: high temperature solder alloy | 12 October, 1999

| | I have a board, 4 spacers needed to be soldered on the board | | first with the normal 62Sn37Pb alloy. Then, capacitors are manually soldered on the boards. The density of the board is quite high. If we wave soldered capacitors first, there will be | | no place for iron to manually solder the spacers. | | So, in order to wave solder capacitors, can I use some high temperature solder alloy, like 75Pb25In. Is there anyone have experience on using this type of solder alloy? or there is some | | better solder to do the job? | | Welcom to any opinion and thank you for your help. | | | | Carol. | | | So Carol, why don't you use a dab of glue to hold these spacers in place, until you wave solder them with the chip components? My2� Dave F | Dave, The solder side of the spacer is in the component side.I can't wave solder spacers and chip components together. Carol Carol

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