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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