Soldering To Aluminum

Reply

  #1  
Old 12-28-10, 02:39 PM
Justin Smith's Avatar
Member
Thread Starter
Join Date: Dec 2010
Location: Cressona, Pa, USA
Posts: 2,546
Soldering To Aluminum

Also, With my lamp retrofitting issues, I need to solder to the aluminum base. I tried heating it up with my heatgun, but the rosin core solder won't stick. I bought lamps at dollartree with aluminum bases that were soldered to, but I can't figure out how to do it.
 
Sponsored Links
  #2  
Old 12-28-10, 02:48 PM
ray2047's Avatar
Group Moderator
Join Date: Mar 2006
Location: USA
Posts: 32,632
There use to be a special solder for this. I'm sure there still is. The problem is for what you want, putting a base on, soldering may not have adequate strength. heliarc welding would be a better way.
 
  #3  
Old 12-28-10, 03:52 PM
Justin Smith's Avatar
Member
Thread Starter
Join Date: Dec 2010
Location: Cressona, Pa, USA
Posts: 2,546
I am only soldering a lead from a resistor, the base is being glued on.
 
  #4  
Old 12-28-10, 03:58 PM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,642
You will not reliably solder to aluminum, even with aluminum solder.
You would be better off making treads for a small machine screw and solder the resistor to a ring terminal.
 
  #5  
Old 12-30-10, 09:15 AM
Justin Smith's Avatar
Member
Thread Starter
Join Date: Dec 2010
Location: Cressona, Pa, USA
Posts: 2,546
How am I supposed to put a machine screw on a candleabra or an intermediate lamp base, and screw it into a lampholder?
 
  #6  
Old 12-30-10, 02:17 PM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,642
I don't know how you would do that.
Your description wasn't clear and my imagination had the base you were referring to being a lamp base that held up a pole and sat on the floor.

I take it now you are referring to the part that the bulb screws into.
Correct?
If so you can not solder that piece.
There is to much heat at that point for solder.
Wires are normally attached there by a spot weld or rivet.

You refer to lamp retrofit issues as if we all know what you are doing.
You are likely missing info in this thread that you have covered in other threads.
This is why we ask that all questions relating to a particular topic be in the same thread.
 
  #7  
Old 12-30-10, 04:21 PM
Justin Smith's Avatar
Member
Thread Starter
Join Date: Dec 2010
Location: Cressona, Pa, USA
Posts: 2,546
The GE and Sylvania were spot welded. Westinghouse were soldered. Both had flame swirl.
 
  #8  
Old 12-30-10, 05:41 PM
GregH's Avatar
Super Moderator
Join Date: Jan 2001
Location: Manitoba
Posts: 9,642
Most likely tig or mig, not solder which are both a high temperature gas enveloped weld.
 
  #9  
Old 12-30-10, 05:50 PM
Justin Smith's Avatar
Member
Thread Starter
Join Date: Dec 2010
Location: Cressona, Pa, USA
Posts: 2,546
All I can see is a ball of copper after the wire. If you have some bulbs from GE or Sylvania with aluminum bases, look at them. The westinghouses, the solder melts with a 25w iron.
Off Topic: I noticed that the ads on the top and side usually involve something with the topic of the thread.
 

Last edited by Justin Smith; 12-30-10 at 05:54 PM. Reason: more info
  #10  
Old 12-30-10, 06:29 PM
Forum Topic Moderator
Join Date: Oct 2002
Location: Hamilton County, Ohio
Posts: 4,287
If I recall correctly, aluminum oxidizes very rapidly when heat is applied which is why the solder wont stick. Try it in a vacuum or with an inert gas welder and it will hold.
 
  #11  
Old 12-30-10, 09:07 PM
Banned. Rule And/Or Policy Violation
Join Date: Oct 2010
Location: Canada
Posts: 448
Apart from the temperature at which the process is done, there are an awful lot of similarities between soldering, brazing and welding.

I'd phone around and ask who welds and/or brazes aluminum in your area. They would be the best people to talk to to overcome your problems soldering aluminum.

As long as you sand to remove any oxide film, and use the correct flux, you should be able to solder and/or braze aluminum.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
'