Ramon,
I am in Singapore and it happen to be one of the hottest month. However, the
work is done within a air conditioning room. How does that condition result in
blow holes?
By the way, all soldering is done manually.
What do you mean by previous recommendations below?
Regards,
Wee Mei
Quoting "Dehoyos, Ramon" <[log in to unmask]>:
>
> Hi Wee Mei:
> High speed of the reflow oven tracks can aid in the rapid
> release of gases from moisture or plating chemistry during PWB or
> component fabrication. Prebaking of the boards and a slower reflow oven
> process can minimize the anomaly. Did the problem started during the
> humid months of summer? If that is the case, previous recommendations
> will help.
> Regards,
> Ramon
>
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: Saturday, July 22, 2006 12:56 AM
> To: TechNet E-Mail Forum; Dehoyos, Ramon
> Subject: Re: [TN] Blowholes pandemic
>
> Ramon,
>
> Just curious besides gas/mositure entrapped in PTHs that cause blowhole,
> what is the cause of blow hole found on SMDs solder joints.
>
> Recently, we encounter very serious occurence of blow holes to SMDs
> solder joints that are repeatable across different operators and on
> different mixed components. Although there it was later found that along
> the process (over a period of bout 5 - 6 months), the types of solder
> and flux had been changed, the process staff do not think the cause is
> due to the change in solder or flux.
>
> However, we do observe that blow hole is lesser by one operator that
> uses lot of flux or applying heat longer to the solder joint.
>
> We also suspect that the components could be tin instead of tin/lead
> plating but they are not fresh purchase and we have been using the same
> batch of component previously without blow holes issue on the same
> design.
>
> Your opinion will be great help.
>
> Thanks and regards,
> Wee Mei
>
>
> Quoting "Dehoyos, Ramon" <[log in to unmask]>:
>
> > Hi Al:
> > A blow hole can be seen with the naked eye. It starts
> > somewhere where gases are trapped and blow like a volcano, leaving a
> > visible hole somewhere at the top. Small gas bubbles can leave voids
> > that are only visible through X-rays. But blow holes is a much greater
>
> > amount of gas that actually erupts leaving a crater. The crater does
> > not necessarily occur at the highest point in the solder joint.
> > Sometimes the gases come through just a bit off to one side of the
> highest point.
> > Blow holes may be a source for solder balls. See 5.2.2 Soldering
> > Anomalies - Pin Holes/Blow Holes in IPC-A-610D
> > Regards,
> > Ramon
> >
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Al Onderick
> > Sent: Tuesday, July 11, 2006 10:31 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] Blowholes pandemic
> >
> > Can someone direct me to a picture of a blowhole in a older joint? Is
> > this seen from the surface or is cross sectioning or xray required?
> >
> > -Al
> >
> > -----Original Message-----
> > From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of
> > [log in to unmask]
> > Sent: Wednesday, June 21, 2006 12:56 PM
> > To: [log in to unmask]
> > Subject: Re: [TN] Blowholes pandemic
> >
> > Hi Ioan,
> >
> >
> > Have you tried and extend your soak time to allow the moisture to
> > escape prior to reaching the liquidus stage. I have seen this problem
> > before and slowing down the profile does help reduce this problem.
> >
> >
> > Best regards,
> >
> >
> > Gilbert Roberge
> > Technical Support Manager
> > Amtech Inc.
> > Ph: 800-435-0317
> > Fx: 203-481-5033
> > E-mail: [log in to unmask]
> >
> >
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
> > Sent: Wednesday, June 21, 2006 11:54 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] Blowholes pandemic
> >
> > Multicore WS200 as WS and AIM NC254 as no-clean.
> >
> > I want to state that both pastes work fine for us and publishing the
> > details is not related to concerns about their performance.
> >
> > Ioan
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]]On Behalf Of Stadem, Richard D.
> > Sent: Wednesday, June 21, 2006 11:41 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] Blowholes pandemic
> >
> >
> > Ioan, which brand and part number solder paste are you using?
> >
> > -----Original Message-----
> > From: TechNet [mailto:[log in to unmask]] On Behalf Of Tempea, Ioan
> > Sent: Wednesday, June 21, 2006 10:28 AM
> > To: [log in to unmask]
> > Subject: Re: [TN] Blowholes pandemic
> >
> > One is ENIG with no-clean paste, the other one is HASL (with WS
> paste).
> >
> > Thanks,
> >
> > Ioan
> >
> > -----Original Message-----
> > From: Lee parker [mailto:[log in to unmask]]
> > Sent: Wednesday, June 21, 2006 11:26 AM
> > To: TechNet E-Mail Forum; Tempea, Ioan
> > Subject: Re: [TN] Blowholes pandemic
> >
> >
> > Ioan
> >
> > It may still be a board problem. I would bake some boards and assemble
>
> > some suspect parts. By the way, what board surface finish are you
> using?
> >
> > Best regards
> >
> > Lee
> >
> > J. Lee Parker, Ph.D.
> > JLP Consultants LLC
> > 804 779 3389
> >
> >
> > ----- Original Message -----
> > From: "Tempea, Ioan" <[log in to unmask]>
> > To: <[log in to unmask]>
> > Sent: Wednesday, June 21, 2006 8:56 AM
> > Subject: [TN] Blowholes pandemic
> >
> >
> > Hi Technos,
> >
> > for a couple of days I see occurences of blowholes in the joints of,
> > guess what, SMT 0603 resistors.
> >
> > The reflow recipe did not change and we're talking about 2 different
> > established products, we have run many of each before. One is WS, the
> > other one no-clean. Each one uses different brand of solder paste,
> SnPb.
> >
> > I have changed the paste with fresh one, no positive results. I have
> > changed the reels with different date codes, Bingo! But even the "bad"
> > parts were quite fresh, less than one year old. One of them is pure Sn
>
> > plated, don't know about the other ones.
> >
> > The question is: where on Earth can humidity stay in a ceramic
> resistor?
> >
> > What else can be the cause of the blowholes? Did not bake the boards,
> > since changing the components worked, so I guess the PCBs are out of
> > the hook...
> >
> > Thanks,
> >
> > Ioan
> >
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