Dear Brandon,
We are using alcohol-based
,no-clean flus which solid content is 2.5+-0.5%,
Best Regards
Charles Lee
From: TGAsia
[mailto:[log in to unmask]] On Behalf Of Brandon
Tang
Sent: Friday, August 21, 2009 8:04
AM
To: [log in to unmask]
Subject: Re: [TGAsia] Solder Balls
Charles
What flux is used on your
PCBA , alcohol-based or water-based ? what’s the solid content of flux?
and is there large pad around PTH connector to absorb heat during wave
solder ?
From: TGAsia
[mailto:[log in to unmask]] On Behalf Of Maker
Cheng
Sent:
To: [log in to unmask]
Subject: Re: [TGAsia] Solder Balls
Hi Charles,
Usually, we can’t control
the solder appear well during the reflow process or wave solder process. Note:
IPC-A-610D has defines the solder ball criteria in Section.
Is wash process or not
wash process in your factory? Maybe you can clear out the solder ball with
brush and wash process.
Maker.
From: charles.lee
[mailto:[log in to unmask]]
Sent: Thursday, August 20, 2009
10:10 AM
To: Cheng, Maker (程仁明
IES); [log in to unmask]
Subject: RE: [TGAsia] Solder Balls
Dear Maker,
It’s definitey
difficult to remove so many solder balls via ESD brush since they are too
small. Another potential problem is that the sodler balls will
become movable balls to hide into pins of ICs after brush.
Best regards
Charles Lee
From:
[log in to unmask] [mailto:[log in to unmask]]
Sent: Thursday, August 20, 2009
9:35 AM
To: [log in to unmask];
[log in to unmask]
Subject: RE: [TGAsia] Solder Balls
Hi Charles,
If you can not prevent the
solder ball appear in you process well, you can clear out the solder ball with
ESD brush in you touch up station after wave solder process to meet IPC
standard.
Maker.
From: TGAsia
[mailto:[log in to unmask]] On Behalf Of Charles
Lee(SVA)
Sent: Wednesday, August 19, 2009
11:03 AM
To: [log in to unmask]
Subject: [TGAsia] Solder Balls
Dear All,
There are a great deal of tiny solder balls appeared
in around PTH connector pins after wave soldering (PB Process) , please see the
attached pictures.
Here we would like to seek your helps and suggestions
on how to solve the solder ball issues, thanks!
Best regards
Charles Lee
