Dear Wilson,
The point is all the PCBA
WIP no need to conduct neither second reflow nor wave soldering process( but
perhaps partial of the boards need hand soldering one or two components ),
and just waiting some assembly
materials to finish it.
Thanks
& Regards
James
Lee
发件人: Wilson Poon
[mailto:[log in to unmask]]
发送时间: 2009年4月20日
16:58
收件人: Asia Committe Task Group Forum;
James lee
主题: RE: [TGAsia] storage of PCBA WIP
Hi James,
Will WIP SMT PCBA run Wave
Soldering afterwards? Will the PTH do Hand Soldering afterwards? If yes, the
long storage on work floor is not appropriate. The PCB and components will absorb
moisture and cause components crack or PCB delamination during second reflow or
wave soldering or even hand soldering. Refer IPC J-STD-033A to control the WIP.
B.R.
Wilson Poon
From: TGAsia
[mailto:[log in to unmask]] On Behalf Of James
lee
Sent: Monday, April 20, 2009 4:25
PM
To: [log in to unmask]
Subject: [TGAsia] storage of PCBA
WIP
Dear Friends,
One of our customer question our PCBA WIP management
procedure since he saw some of SMT / PTH subassemblies boards were keeping in production
area longer than 3 days,
Some of the boards are longer than one weeks and even
a few pcs longer than 1 month, so we had a big discussion about the shelf life
of the assembly boards but end of our discussion
It seems he was not convinced, hereby I need your help
to let know is there any IPC standards to describe this rule?
Thanks
& Regards
James
Lee
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