Hi Andy,
I think your setting temperature is relatively low. Certainly, it may work
if the heat capacity of pad / component is low + using suitable size of the
soldering tip (size should be just smaller than pad) + good heat transfer /
recovery rate of soldering iron. In other hand, the activity of the core
flux can help << note: you should also consider the electrical reliability
if choosing high activity of flux >>
You can do the pull/ push test to verify the strength and do cross section
to see the intermetallic layer's thickness / wetting angle to validate the
solder joint
Merry Christmas
Jackson
Technical Services Manager
Cookson Electronics - Alpha Metals HK
-
"andy.xu"
<andy.xu@amphenol
rfa.com> To
"'Jackson Chan'"
2007/12/24 上午 <[log in to unmask]>
08:55 cc
<[log in to unmask]>
Subject
Please respond to RE: [TGA] 焊鐵頭溫度設定
<andy.xu@amphenol
rfa.com>
Hi Jackson,
Thanks a lot of your surport.
我們設置的溫度範圍為︰426~450℃，一般調至435℃,但在焊接時經常會出現過熱焊
點，所以就很困惑。
我們有做試驗，把溫度調至350℃~385℃之間，焊點的潤濕效果還不錯，且不易出現過熱
焊點，焊鐵的壽命也有提高，請問這樣設定的話，會不會有問題？
Best Regards!
Andy Xu（徐 晟）
Clean Room
Amphenol RF Asia Corp.
Tex : +86-755-2754 9918 (ext.2304)
Fax : +86-755-2754 9718
Cell : +86-1300 6655 655
E-mail : [log in to unmask]
-----Original Message-----
From: Jackson Chan [mailto:[log in to unmask]]
Sent: Saturday, December 22, 2007 7:54 PM
To: [log in to unmask]
Cc: [log in to unmask]
Subject: Re: [TGA] 焊鐵頭溫度設定
Hi Andy,
I think IPC has no international standard for this type of " setting "
temperature of your soldering iron machine. In addition to the alloy and
the activity for core flux of soldering wire, you should also consider the
following factors when establishing your " setting" temperature of your
machine
1. How fast to produce the solder joint ?
Typically, 2 -3 sec. For heat-sink conmponent, longer time may be
required.
2. Is it heat sink component or only generall type of component ?
3. Any heat- sensitive component ? If yes, what is the temperature ?
4. Heat transfer capability and temperature recovery capability of your
soldering iron ?
5. What is the size of pad ?
6. What shape and its size should be chosed ?
You can design the experiment. Use the thermocouple to measure the change
of the temperature of the soldered area when applying the wire and
soldering tip to see what temperature acheived (+ wetting performance) when
using 2 or 3 sec as the contact time of the soldering iron.
There is the general rule but not true for all condtions. I list here for
your reference only. Typically, the wetting should be acceptable if the
temperature of the solder reach above 50 deg. C over the alloy 's liqudius
point. If the alloy's liquidius temperature is 299 deg. C, the soldering
temperature for acceptable wetting to occur is around 350 deg. C.
However, you should also consider the " time" and " heat capability"
factor, Therefore, for the temperature setting at your machine, the
general rule is 100 deg. C > the soldering temperature. In your case, 350
deg. C + 100 deg. C = 450 deg. C.
Take an other example, 63/37 alloy, the melting point is 183 deg. C. The
soldering temperature should be 183 + 50 = 233 deg. c. For the settting
temperature, 233 + 100 deg. C = 333 deg. C
Jackson Chan
Technical Services Manager
Cookson electronics - Alpha Metals Hong Kong
"andy.xu"
<andy.xu@AMPHENOL
RFA.COM> To
Sent by: TGAsia [log in to unmask]
<[log in to unmask]> cc
Subject
2007/12/22 上午 [TGA] 焊鐵頭溫度設定
09:00
Please respond to
andy.xu@amphenolr
fa.com
各位朋友,
在進行手工焊接時,焊鐵頭的溫度該如何設定?
如使用的錫絲為:Kester SN10PB88AG2 #58/245,其溶融溫度為:268~299℃,那麼焊鐵頭
的溫度該設定到多少?
有哪位知道,請不吝賜教!
謝謝!
Best Regards!
Andy Xu（徐 晟）
Clean Room
Amphenol RF Asia Corp.
Tex : +86-755-2754 9918 (ext.2304)
Fax : +86-755-2754 9718
Cell : +86-1300 6655 655
E-mail : [log in to unmask]
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