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SMT solder joint quality and appearance inspection process


As technology developed, mobile phones, consumer electrics and other electronic products are become more and more light, small, portable, The development trend in the SMT Assembly process of the electronic components become more smaller, Many previous 0603 ,0402 chips already changed to 0201 01005 size. How to ensure the quality of solder joints between chips and PCB become an important issue precision placement. Welded joints as a solder bridge, its quality determines the quality and reliability of electronic products. That is, in the SMT production process,final performance of the soldering quality is the solder joints.


In the past few years, in the electronics industry,The studies of lead-free solder made great progress, we have mostly use the lead free solder in the world, and environmental issues are also receiving widespread attention, using soldering technique SnAgCu,SnCu and other lead free solder alloy has become the main connection technology in electronic circuits.

Good joints should be within the life cycle of the equipment, The mechanical and electrical properties are not failures occur. The appearance as follows:

(1) complete and smooth shiny surface;
(2) The appropriate amount of solder and solder pads completely cover the welded parts and the PCB;
(3) Good wetting; edge solder should be thin, the wetting angle of the solder and the pad surface 300 or less, the maximum no more than 600.

SMT processing visual inspection content:
(1) whether there is missing element;
(2) Have posted the wrong element;
(3) short-circuit;
(4) what's the solder problem ; if the reason is complex.
First,Solder quality judgment
1. Using line tester equipment for testing.
2, or AOI visual inspection. When they find too little solder joints solder wetting ability is bad, or the middle of a broken seam solder, solder or convex spherical surface, or solder melting time and the SMD place wrong position and so on, will draw attention, even if the phenomenon will cause a slight risk, It should immediately determine whether a problem exists. Judgment method is: to see whether the same position has more joints problems on the PCB, as only one individual PCB, solder paste may be scratched, pin deformation and other reasons, If in the same position on many PCB has a problem, then it might be a bad component or have problems caused by pick and place machine.


Third, sldering problem and solutions
PCB pad design defects.PCB Pad is a major participator in SMT PCB soldering process, if the pin pad distance is too samll, maybe will lead the solder bridge and other problem, so need check PCB design and this kind problem should be corrected as soon as possible.

Flason Electronic Co.,ltd provide a full smt assembly line solutions, including SMT reflow ovenwave soldering machinepick and place machinesolder paste printerPCB loaderPCB unloaderchip mounterSMT AOI machineSMT SPI machineSMT X-Ray machineSMT assembly line equipmentPCB production Equipment smt spare parts etc any kind SMT machines you may need, please contact us for more information: wechat whatsapp:008613691605420, Skype: flasonsmt, Email: sales@flason-smt.com


FAQ

1) This is the first time I use this kind of machine, is it easy to operate?

There is English manual or guide video that show you how to use machine.

If you still have any question, please contact us by e-mail / skype/ phone /trademanager online service.

2) If machine have any problem after I receive it, how can I do ?

Free parts send to you in machine warranty period.

If the part is less than 0.5KG, we pay the postage.

If it exceeds 0.5KG, you need to pay the postage.

3) MOQ ?

1 set machine, mixed order is also welcomed.

4) How can I buy this machine from you? ( Very easy and flexible !)

A. Consult us about this product on line or by e-mail.

B. Negotiate and confirm the final price , shipping , payment methods and other terms.

C. Send you the proforma invoice and confirm your order.

D. Make the payment according to the method put on proforma invoice.

E. We prepare for your order in terms of the proforma invoice after confirming your full payment.

And 100% quality check before shipping.

F.Send your order by air or by sea.

5)Why choose us ?

A. Gold supplier on Alibaba !

B. Trade assurance to US$54,000 !

C. Best price & Best shipping & Best service !


Contact information



CONTACT US

Contact: Andrey

Phone: 13691605420

Tel: 0755-85225569

Email: sales@flason-smt.com

Add: Flason Industry park Shajing Town Baoan district shenzhen China 518104