Could you pls give some pictures
I'm repair engin maybe i can help you



Alvin Ling <[log in to unmask]> 
Sent by: TGAsia <[log in to unmask]>
03/17/2011 01:59 PM
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Alvin Ling <[log in to unmask]>


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Re: [TGAsia] 回覆: [TGAsia] 回覆: [TGAsi a] leadfree h and s oldering t 
emperature






should be use rework station not hot gun .
 
Alvin
----- Original Message ----- 
From: Tom Zhang 
To: [log in to unmask] 
Sent: Thursday, March 17, 2011 12:43 PM
Subject: [TGAsia] 回覆: [TGAsia] 回覆: [TGAsia] leadfree h and s oldering 
t emperature

Dear  Patricia Lui
                              You try hot air gun to remove components of 
4 legs.
 
Best regards
Tom Zhang (张涛)
Customer Service Department
FIC (Suzhou) Inc.
Tel: +86 512 62581988 Ext:5629
Fax:+86 512 62581973
Email:[log in to unmask]
 

寄件者: TGAsia [mailto:[log in to unmask]] 代理 Patricia Lui
寄件日期: 2011年3月17日 12:32
收件者: [log in to unmask]
主旨: Re: [TGAsia] 回覆: [TGAsia] leadfree hand s oldering t emperature

Thanks Tom,
 
I have a common complain of pads lift especially when the rework guy have 
to remove components with 4 legs. I have examined how the rework guy do to 
remove the components. He have used the tip of the soldering iron to rub 
on all the 4 solder joints until all the solder of the 4 legs melt then he 
pull out the component. I believe by metling the 4 legs together take a 
longer time which have caused the pads to be over heated and the pads lift 
up. Can you advice me what is the proper way we should do to remove a 4 
leg component so as not to over heat the pads. Hope to have your advise.
 
Thanks & Best Regards
Patricia Lui
Xuan Technologies
 


--- On Wed, 16/3/11, Tom Zhang <[log in to unmask]> wrote:

From: Tom Zhang <[log in to unmask]>
Subject: [TGAsia] 回覆: [TGAsia] leadfree hand soldering t emperature
To: [log in to unmask]
Date: Wednesday, 16 March, 2011, 8:49 AM

Temperature is too low  I advise temperature setted  380+(-)10 degC.
 
Best regards
Tom Zhang (张涛)
Customer Service Department
FIC (Suzhou) Inc.
Tel: +86 512 62581988 Ext:5629
Fax:+86 512 62581973
Email:[log in to unmask]
 

寄件者: TGAsia [mailto:[log in to unmask]] 代理 Patricia Lui
寄件日期: 2011年3月15日 23:17
收件者: [log in to unmask]
主旨: [TGAsia] leadfree hand soldering temperature


Dear Sir,
 
I have a customer who often complains boards supplied by us have pads lift 
issue when they do hand soldering rework. This customer is using hand 
soldering with temperature set at 320-349 degC for leadfree soldering 
rework and the boards supplied by us are with Tg130-140 degC only. We hope 
to have your expertise advice what is the common leadfree hand soldering 
temperature and if need to withstand 320-349degC hand soldering 
temperature, what Tg material should be used. 
 
Hope to receive your favourable advise. 
 
Thanks & Best Regards
Patricia Lui
Xuan Technologies


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