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

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Edmund

#9592

Best reflow temperature | 15 September, 1999

Hi,

Can someone pls suggest to me the best reflow temperature setting for a force air convection oven. The details is as follow. 1) Heller 1700s 2) 12 zone---6 top and 6 bot 3) Solder paste --- Qualitek 691 non clean 4) board size : 159mm X 159mm

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Earl Moon

#9593

Re: Best reflow temperature | 15 September, 1999

| Hi, | | Can someone pls suggest to me the best reflow temperature setting | for a force air convection oven. The details is as follow. | 1) Heller 1700s | 2) 12 zone---6 top and 6 bot | 3) Solder paste --- Qualitek 691 non clean | 4) board size : 159mm X 159mm | As has been said many times, look first to basic paste supplier profiling information as text or graph. Run your boards, (representative of production types if available - fully loaded or simulated) with thermocouples, moles, or whatever. Then, collect the results and go from there.

Again, in my current and past three contracts, we run only two basic profiles, each with choices or N2 or O2, and one other hotter profile to cover the gaps. These are based on the above and product quality as solder joints meeting specified acceptance criteria.

Earl Moon

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Scott S. Snider

#9594

Re: Best reflow temperature | 15 September, 1999

| Hi, | | Can someone pls suggest to me the best reflow temperature setting | for a force air convection oven. The details is as follow. | 1) Heller 1700s | 2) 12 zone---6 top and 6 bot | 3) Solder paste --- Qualitek 691 non clean | 4) board size : 159mm X 159mm

I agree with E.Moon. If you want to know what temperatures to set your oven you must profile with thermocouples. I have the same oven but use a different paste. We run over 200 different assembly numbers and we have only 4 profiles. We will probably be down to 2 soon. Unless you are running some board packed with large packages and others with just discretes, you just need to match the paste suppliers recommendations and most of your boards will run on single profile. SSS

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Earl Moon

#9595

Re: Best reflow temperature | 15 September, 1999

| | Hi, | | | | Can someone pls suggest to me the best reflow temperature setting | | for a force air convection oven. The details is as follow. | | 1) Heller 1700s | | 2) 12 zone---6 top and 6 bot | | 3) Solder paste --- Qualitek 691 non clean | | 4) board size : 159mm X 159mm | | I agree with E.Moon. If you want to know what temperatures to set your oven you must profile with thermocouples. | I have the same oven but use a different paste. We run over 200 different assembly numbers and we have only 4 profiles. We will probably be down to 2 soon. | Unless you are running some board packed with large packages and others with just discretes, you just need to match the paste suppliers recommendations and most of your boards will run on single profile. | SSS | | SSS,

Appreciate the concurrence. Do have a question concerning the board burner. Seems like Heller has come a long way. Haven't used one since I can't remember - though not unusual for me. The one you guys are discussion seems pretty good, eh? Please tell me more about it.

MoonMan

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Scott S. Snider

#9596

Re: Best reflow temperature | 16 September, 1999

| | | Hi, | | | | | | Can someone pls suggest to me the best reflow temperature setting | | | for a force air convection oven. The details is as follow. | | | 1) Heller 1700s | | | 2) 12 zone---6 top and 6 bot | | | 3) Solder paste --- Qualitek 691 non clean | | | 4) board size : 159mm X 159mm | | | | I agree with E.Moon. If you want to know what temperatures to set your oven you must profile with thermocouples. | | I have the same oven but use a different paste. We run over 200 different assembly numbers and we have only 4 profiles. We will probably be down to 2 soon. | | Unless you are running some board packed with large packages and others with just discretes, you just need to match the paste suppliers recommendations and most of your boards will run on single profile. | | SSS | | | | | SSS, | | Appreciate the concurrence. Do have a question concerning the board burner. Seems like Heller has come a long way. Haven't used one since I can't remember - though not unusual for me. The one you guys are discussion seems pretty good, eh? Please tell me more about it. | | MoonMan | I'll try avoiding like and advertisement for Heller. I've used several different oven over the past 14 years. In the early years RTC and Vitronics, later Electroverts, Vitronics, Conceptronics, etc. In my opinion most people are running easy boards to reflow and most oven will get the job done. Now if you are doing Copper-Invar-Copper boards with LCC's (like in a previous job) you need a special oven. So the question comes down to line speed and cost. With cost I mean total cost including maintenance, installation, floor space, etc. For me the Heller fit the bill. I now have two of them one which was purchased used. Both run great with only the occasional blower motor replacement required. The newer 1700 is pretty easy to replace blower motor in. The blower motors have a lifetime warranty which just means you get replacement for free not that they last anywhere near a lifetime. Both my ovens have mesh and edge conveyors. They are air cooling so no H20 required. Also I don't need Nitrogen for any applications. The software interface to the operator is simple so little training is required. We change operators like most people change underwear (monthly ;)) so ease of use is required. We also run 24 hours 5 days a week. The oven has almost no downtime and the maintenance is performed by non-technicians (low cost). Bottom line for us it is a low cost solution. That may not be the case for anyone else - prices change constantly. Also once you have one type of oven it makes since to keep the same manufacturer if it is performing. SSS

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reflow oven profiler

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