Professional SMT Soldering: Hand Soldering Techniques - Surface Mount

Professional techniques for multi-lead hand soldering to IPC class 3 standard. http://solderingtraining.com. John Gammell, Certified IPC Trainer. STC on Facebook:
http://tinyurl.com/stc-llc

Category:

Howto & Style

Tags:

• SMT
• Surface Mount
• Soldering
• SOIC
• QFP
• How to Solder
• Soldering Tips

[RobotN001]

humans work look so boring and drearily. and i suppose it is not lead-free. suicidal lead was used here !

[jkgamm041]

@RobotN001

Isn't it just awful ! It is the "suicidal' lead we have been using since the very beginning of soldering technology history, which has led to the greatest evolution in technological advancements of high reliability interconnections, for Class 3 High Performance Electronic Products.

STC is a specialist in lead-free applications using SAC 305 (silver), SN100C (Nickel) and SN 100E (Cobalt). I make it wet like a tin/lead eutectic paste, using a pre-heater. Lead-free is very easy.

[djravery]

Good looking joints! I hafta mention tho, that tip looks a bit large for the fine-pitch used in the vids. Having the larger surface area helps store solder for the entire row of leads, however, I would also think that a tip temp of 650f or maybe even lower, would be sufficient with that large of tip.

[jkgamm041]

@djravery

I wish to comment on this for all viewers. This is the best of questions. 1) The larger type of hoof tip or drag soldering tip is necessary to achieve optimum wetting of the solder. Tin/lead at 600 F or lead-free between 650-700 F. My concern is not a large tip size but my "dwell time". If my dwell time on each joint is averaging 2 seconds, using a tacky flux then my technique only subjects the leads to thermal stress one time. Use a heat gun with lead-free to improve wetting.

[djravery]

@jkgamm041 I concur! And thanks... I have been SMT soldering for a number of years (I'd date myself, if I said how many years exactly). I completely agree with (and use personally) this technique. Its not the tip size, its the dwell time. Followed closely by the flux type... unf newer no-clean have the tendency to 'flash' off VERY fast due to the chemical makeup of the flux.  Organic water soluable fluxes are so much easier to work with eh?

[jkgamm041]

@djravery

You are correct. The large hoof tip creates an immediate "heat bridge" melting the solder into its liquidous phase. Wetting action occurs rapidly. I try to keep my "dwell time" under 2-3 seconds. I recommend trying a no-clean tacky flux.

Clarification please. No-clean fluxes such as the Kester 951 or 959 with low solids

(2-4%) will flash off faster than a high solids no-clean or tack flux but they are still highly effective as long as excessive oxides are not present.

[jkgamm041]

@VeXorian1337

Thank you very much. Automation is a primary function in PCB manufacturing, however, rework, replacement and other applications require the skills of a professionally trained operator/ technician in which the machine alone cannot perform.

What is the cost benefit analysis associated with doing an R & R on an SMD? If I can pull with hot air or low melting alloys and replace quickly, which I can, will the time justify the expense and profit margin or do I buy a replacement?

[5216l]

I always wondered how they got it to look so perfect and neat. Now I know!

[07734world]

so perfect!!!

[Isalys555]

Wow, really neat.

[bikernut1969]

That negro can really solder. Nice video.

[Idkfawin32]

This video is great. But also, I'd really love to know what the background song is, its wonderful.

[metaldetectingguy]

Great video. Doing this style of soldering for over 25 years.

[CxC2007]

Beautiful !!

[Shaunakde]

Hey, thanks for this great demonstration on SMD soldering. Is it OK to solder SOIC parts with a standard 15W rod?

[ssikka1000]

Congratulations John Gammel. Your training finally paid off. This is Sarbjit ..

[TutorialeSolenza]

dude, your sodering technique is awsome :D LIKE A PRO :)