Home > Industry news

Outgassing on a Printed Circuit Board-WAVE SOLDERING DEFECTS

Outgassing is still a common problem associated with wave and hand soldering. Basically when a board is soldered any moisture in the board close to the hole is heated and turned to vapor. If there is thin plating or voids in the plating, gassing can come through the plated hole wall. If solder is present in the hole, this will produce voids in the solder as it solidifies. The voids may appear as small holes in the surface of the joint, as shown in Figure 1, or much larger cavities.

Having the correct copper plating thickness in the through holes is the key. A minimum of 25µm of copper should be present on the surface of the hole walls.

Figure 1: Voids caused by outgassing
Figure 1: Voids caused by outgassing.

Most Common Reasons or Solutions:

  • Poor pre heat process when using VOC free fluxes leads to spitting of very fine solder balls.
  • This plating of less that 20um in the through hole or where the surface of the hole is so poor the plating does not cover broken glass bundles leading to gassing.
  • In the old days you could have outgassing from the plating on pins but not to the degree shown.


SMT Reflow OvenLead free Reflow OvenReflow Oven ManufacturerLED reflow ovenPCB Reflow OvenNitrogen Reflow OvenDual Rail Reflow OvenChina Reflow Ovenwave soldering machineDual Rail Wave Soldering MachineNitrogen Wave Soldering MachineWave Soldering Machine Manufacturer.

Flason Electronic Co.,ltd provide a full smt assembly line solutions, including SMT reflow oven, wave soldering machine, Pick and place machine, solder paste printer, PCB loader, PCB unloader, Chip mounter, SMT AOI machine,SMT SPI machine, SMT X-Ray machine, SMT assembly line equipment, PCB production Equipment smt spare partsetc any kind SMT machines you may need, please contact us for more information: wechat whatsapp:008613691605420, Skype: flasonsmt, Email: [email protected]


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: Mr Tommy

Phone: +86 13691605420

Tel: 0755-85225569

Email: [email protected]

Add: No.94,Guangtian Road,Songgang Street,Bao an District Shenzhen China