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Double Rifles, Single Shots & Combinations >> Double Rifles

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gryphon
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Reged: 01/01/03
Posts: 5487
Loc: Sambar ground/Victoria/Austral...

Joining barrels of a double gun
#202560 - 15/02/12 06:47 PM

A mate and I were discussing this and are of the thought that if welding them or soldering them together how is it done without heat distorting the barrels?

I have no idea and told the mate that "i will find out on Nitro`s as there are the learned men on their to tell us".

--------------------
Get off the chair away from the desk and get out in the bush and enjoy life.

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kamilaroi
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Reged: 18/12/04
Posts: 1803
Loc: sydney, new south wales, Austr...

Re: Joining barrels of a double gun [Re: gryphon]
#202571 - 15/02/12 07:57 PM

Some might use TIG or MIG on the lumps.

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Pugwash
.300 member

Reged: 24/03/07
Posts: 113
Loc: Scotland,UK

Re: Joining barrels of a double gun [Re: kamilaroi]
#202574 - 15/02/12 09:06 PM

The barrels are silver soldered together.This is normally done in a furnace with the length of the barrels protruding from it through a hole in the door.They can also be done with a torch as long as the heat goes properly through them allowing the solder to run properly through the joint.They must then be allowed to cool slowly as this will stop them developing any hard spots which can hinder with machining the lumps and chambering.
Welding is not really an option as it will only join the barrels on the edges of the joint and this wont be strong enough for use.Also because of the type of steel used to make barrel any welding will tend to create hard spots around the welds.
Hope this helps.

Regards

Mark

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NitroX
.700 member

Reged: 25/12/02
Posts: 39896
Loc: Barossa Valley, South Australi...

Re: Joining barrels of a double gun [Re: gryphon]
#202576 - 15/02/12 09:35 PM

Alan Moon aka 4seventy has personal experience in re-soldering barrels together, plus regulating them etc.

Drop him a line Gryph if you want to do it.

I'm sure he has commented on it in the past too.

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John aka NitroX

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tinker
.416 member

Reged: 12/03/05
Posts: 4835
Loc: Nevada

Re: Joining barrels of a double gun [Re: NitroX]
#202584 - 16/02/12 12:02 AM

Lumps get silver solder or brazing alloy, the remainder of the tubes spacers and ribs get a much lower melting soft solder.
The lower melting soft solder facilitates adjustments during regulation.
Although uncommon among quality guns and rifles, some few makers also use higher melting (hard solders or brazing) on the barrels/ribs.

Cheers
Tinker

--------------------
--Self-Appointed Colonel, DRSS--

"It IS a dangerous game, and so named for a reason, and you can't play from the keyboard. " --Some Old Texan...

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gryphon
.450 member

Reged: 01/01/03
Posts: 5487
Loc: Sambar ground/Victoria/Austral...

Re: Joining barrels of a double gun [Re: tinker]
#202605 - 16/02/12 05:13 AM

Thanks for replies members,the 'furnace' reply from Pugwash is prob the answer the mate was looking for.

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Get off the chair away from the desk and get out in the bush and enjoy life.

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DarylS
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Reged: 10/08/05
Posts: 27008
Loc: Beautiful British Columbia, Ca...

Re: Joining barrels of a double gun [Re: gryphon]
#202609 - 16/02/12 05:23 AM

Normally Belgium barrels on shotguns were brazed full length, while British guns were soft soldered.

Scraping the rib.barrel joint under the forend was a common method to check whether it was British or Belgium made when the stamped names used were sometimes fraudulently duplicated or fairly closely approximated in the 1800's and early 1900's to put off Belgium guns as being British made.

Even in 1850, W.Greener spoke of this in a SanFransisco newspaper. W.W.Greener was still speaking of it in 1911's, 9th edition of "The Gun and it's Development".

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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DUGABOY1
.400 member

Reged: 02/02/03
Posts: 1340
Loc: TEXAS USA

Re: Joining barrels of a double gun [Re: kamilaroi]
#204986 - 12/03/12 05:59 AM

Quote:

Some might use TIG or MIG on the lumps.

Normally the flat surfaces of the chopper lump barrels that make up the breech end of the barrel set are normally brazed together! This sometimes done by wiring the two together after painting the mating surfaces with a mixture of flux, and powdered brass, then placed in a fired or electric furnace and heated till the powdered brass fuses the two together.

With the shoe-lump, barrels this section is made up of four parts, for the breech end of the quarter rib, the two barrels, and the shoe which is a saddled platform with the lumps on it’s bottom. or dovetail sometime three parts and sometimes four parts, Both these are painted with the mixture, wired together, and done in the furnace as well. The rest of the barrel set is usually soft soldered together wedges, and ribs front sight ramp.

Below is an example of Heym shoe-lump barrels.

Edited by DUGABOY1 (12/03/12 06:04 AM)

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