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Thread: welding brass
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3rd Dec 2008, 06:59 PM #1Hammer Head
- Join Date
- Jan 2005
- Location
- Sydney
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welding brass
any one weld brass, i need to weld or solder a base plate onto some SHS,
anywhere in Sydney can help let us know.
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3rd Dec 2008, 07:04 PM #2
Are you asking for someone to do it for you as a service, or do you have propane torch/oxy gear/TIG and need help knowing how to do it yourself?
Soldering this sort of stuff is a pain. That steam engine I started working on 3 years ago is still incomplete because the soldered base plate on the back came off when I drilled the ports. Next time I'm TIG welding everything.
Silver solder on the other hand, I've always had huge success with and never had a joint fail.
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7th Dec 2008, 09:30 AM #3Intermediate Member
- Join Date
- Apr 2008
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- Sydney
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- 42
Brass can be welded with tig or oxy but its a pain in the you know what because the zinc like to burn and boil up. Silver solder is a much better option. And considering you're joining it to steel I don't think there is any other option. Not sure if brass can be bronze welded. If it can then it can be done by mig with bronze wire and pure argon.
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7th Dec 2008, 10:59 AM #4
Guys
A heads up for the terms used
For Joining brass with thermal methods the terms used can be confusing to lay people ,but if we stick to what are the industry standards, it is pretty straight forward.
Braze welding or Brass welding.
Joining the brass parent metals together so as to fuse each into the other using the same type filler as the parent metals.The whole of the parent metal and filler deposit are of the same metallurgical make up.Used on brass and bronze alloys
Brazing
To use a copper brass alloy filler to BOND the parent metals together. At no time does the parent metal come up to welding (fusion ) temperature..Used on most ferrous metals and straight copper.
Silver soldering
Similar to but the same as brazing but employer an alloy that melts at a much lower temperature typically just above soldering temperature. Silver solder or Silver Brazing Alloy (S.B.A.) contains a percentage of silver according to the type it is/there are about 12 different grades of the stuff according to the application needed.
Warning ! a few of these grades contain CADNIUM and are not suitable for food grade applications.
Most of the above contain zinc which an controlled by observing and maintaining the temperature window in which the brazing is carried out in.Exceed this temperature and the zinc will change from molten to gas state and boil out. Once you let the smoke out it is no longer any good as a bond.
Note the term bond.The brazing process is a mechanical more so than welded joint - like a glue joint where the filler bonds in the the micro cavities in the parent material. The filler and parent metal never fuse or weld together.
In Gaza's case no can be sure what he is asking,("any one weld brass,i need to weld or solder a base plate onto some SHS, ")
Is he welding a brass base plate to steel RHS ?.If so it is not welding but brazing.
Answers will vary greatly depending on the parent metal type, application, section and dimensions, as to the best possible solution
If non ferrous to RHS the best and cost effective method is brazing the work with oxy acetylene . Any engineering works with an oxy acetylene set can do this this for him.
Another nit is hereby picked,
Have a good weekend ,everyone
Grahame
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