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Silver solder

Discussion in 'Gunsmithing and Repairs' started by KY DAN, May 6, 2022.

  1. KY DAN

    KY DAN Member

    Jan 10, 2019
    20220506_081205.jpg 20220506_080813.jpg 20220506_080824.jpg I have never soldered anything in my life..

    I need to solder some brass primer tubes, they fit Dillon rl1000. Before anyone interjects no Dillon can not provide this part nor will new production primer tubes work, therefore I must machine them.

    I have a map gas and oxygen torch set.

    I need to know what kind of flux to get, how to apply the flux properly, and if the silver solder from harborfreight will work in this application.

    The pictures below show a hat that must be attached and then turned on a lathe for additional features. I created a bevel and assumed solder would be like welding where you fill the bevel up flush.


    Thanks for your help
  2. PWC

    PWC Member

    Feb 20, 2018
    Central AZ
    If he part is not going to be mechanicaly stressed, regular solder can ne used much more easily.

    The important thing is to have both halves CLEAN. Apply any good wayer soluable flux, do not put solder on the flame. Heat the joint, remove the flame and touch the solder to joint. If it is hot enough, the sloder will flow into the joint.

    It'll survive machining if you don't get carried away with the feed.
    Last edited: May 6, 2022
    AlexS1 and ms6852 like this.
  3. 1911JAS

    1911JAS Member

    Aug 4, 2004
    The item you referenced is used to sweat pipes. I would use a Flux paste on both surfaces and sweat it like a copper pipe. Apply heat gently and have the joint melt the solder.
    Might want a thinner solder or a Flux core electronics solder.
    beag_nut likes this.
  4. whughett

    whughett Member

    Mar 26, 2008
    Rhode Island
    YouTube. Tons of how to videos. A video is worth a thousand words. ;)
    AlexS1 and Hikingman like this.
  5. beag_nut

    beag_nut Member

    Nov 21, 2011
    Seymour, CT
    If both items are plain brass (as they appear to be) then plain old low-temperature solder is the choice. MAPP gas is not needed, except for higher-temperature jobs. When Harbor Freight says that stuff is "silver solder", they are not being accurate. Read the ad and see where silver is mentioned as a component. It is truly lead-free, and that's it. True silver solder has silver in it. The HF stuff looks OK, especially considering the low melting point. Don't get it too hot or the solder will begin to degrade, and the flux will burn away. Whatever, take it slow and easy, and practice beforehand on some other bits of brass, since you say you have never soldered before. And take the advice about looking at youtube videos.
    .38 Special likes this.
  6. Big Bore 44

    Big Bore 44 Member

    Sep 2, 2019
    Brass to brass, I prefer Sil-Phos. No flux required and it's much stronger than plumbing solder.
    GerryER likes this.
  7. Kp321

    Kp321 Member

    Jul 12, 2012
    West Texas
    Brownells Force 44 solder has a small amount of silver in and is available with flux core so no separate flux is needed. I have used it to attach shotgun Poly Chokes so it is plenty strong. Not sure what the melting temperature is without referring to the catalog but it is under 500 degrees. It’s not cheap but works great and is very convenient.
    BBBBill likes this.
  8. BBBBill

    BBBBill Member

    Mar 7, 2005
    Alabama and Florida
    I've used it for years with positive results. Never had a failure with it.
    Last edited: May 15, 2022
  9. Hugger-4641

    Hugger-4641 Member

    Jan 21, 2021
    West TN
    The biggest mistakes people make using solder have been mentioned:

    1. Unclean surfaces
    2. Heating the solder instead of heating the metal and then touching with solder.
    3. Overheating.

    There is another obscure option if both parts are really brass. If you know someone who is a really good Tig welder, it can be tig welded. A race shop or aviation service shop would probably have such a person.
    I have tig welded some brass parts, but nothing that small.
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