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#582181 - 10/17/20 07:05 AM Re: Un-doing holes [Re: rocky mtn bill]
Stan Online   content
Sidelock
**

Registered: 01/03/02
Posts: 10455
Loc: somwers in Jawja
Absolutely priceless, Kutter. Thank you!

I have a Remington 870 barrel that came on a Wingmaster i recently bought, that has a 34" vent rib barrel. Pretty rare barrel, but damaged. Original owner drilled holes behind the muzzle to achieve a reduction in muzzle rise, like porting but done with a hand drill very sloppily. Probably 10-12 on each side of the rib.

I'd like to salvage that barrel. Is micro welding the best bet for it? Do you think a good micro-welder could get sufficient penetration to fill the holes all the way to the bore wall?

SRH
_________________________
Doves ain't hard to hit ........ they're just so easy to miss.

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#582188 - 10/17/20 09:19 AM Re: Un-doing holes [Re: rocky mtn bill]
rocky mtn bill Offline
Sidelock
**

Registered: 02/06/08
Posts: 1725
Loc: MT
Kutter, Thanks. I wouldn't have thought that 22 barrel was possible. Is there danger of pushing a dent into the bore? Also. do you enlarge the opening of a screw hole as Der Ami suggests?
_________________________
Bill Ferguson

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#582189 - 10/17/20 09:46 AM Re: Un-doing holes [Re: rocky mtn bill]
82nd Trooper Offline
Sidelock
*

Registered: 03/19/19
Posts: 74
Great post Kutter. You like many on these forums could be writing books on this subject matter.

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#582191 - 10/17/20 10:30 AM Re: Un-doing holes [Re: rocky mtn bill]
craigd Offline
Sidelock
**

Registered: 02/18/09
Posts: 6867
Thanks also Kutter for sharing the comments and the great picture sequence. Would you have any quick thoughts on what filler steel type or types to consider on an obsolete arm for finish matching?

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#582197 - 10/17/20 02:14 PM Re: Un-doing holes [Re: rocky mtn bill]
Der Ami Offline
Sidelock
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Registered: 07/04/12
Posts: 3563
Loc: East Alabama
Bill,
The idea is not so much to enlarge the hole as to remove the area of the thread, where it "runs out" and the screw would finish to a razor's edge. This little edge almost always breaks off, so you can see it it you look closely. Try one on a piece of scrap, and you will see what I mean. It might work with a #30 drill, I just use the clearance drill to be sure.
Mike

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#582205 - 10/18/20 08:55 AM Re: Un-doing holes [Re: rocky mtn bill]
rocky mtn bill Offline
Sidelock
**

Registered: 02/06/08
Posts: 1725
Loc: MT
Der Ami, thanks for that clarifcation.
_________________________
Bill Ferguson

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#582211 - 10/18/20 09:51 AM Re: Un-doing holes [Re: rocky mtn bill]
Mike Hunter Offline
Sidelock
***

Registered: 12/17/08
Posts: 271
Kutter, awesome post, and awesome work…thank you.
Extra holes are the nightmare for restorers, especially screw holes.

Here’s sort of a rundown of issues that I run into when dealing with holes, especially on barrels.

Most screws (especially gun screws) are made out of 12L14, it has lead added for increased machinability. 12L14 will not weld well, due to the lead, lots of porosity, especially with TIG. 12l14 also rusts quicker than any steel that I know of.

I once had a receiver with a couple of extra holes That I plugged and peened, then the receiver was nickel plated. The repair showed up about a year later, the seam between the base metal and plug had gotten some sort of contamination in there started rusting under the plating.

Screw holes inherently have a lot of crap in threads, and will eventually leak/leach out around the seams. It also provides an excellent source of contamination when TIG welding. If I’m plugging a screw hole, I always drill it out to remove the threads.

Most barrels made prior to 1900 were made out of mild steel fairly close to 1018/20. Many barrels, especially smokeless barrels made after 1930 were made out of 4140, different steels. Really need to plug with like materials.

Welding a plug into 4140 presents its own challenges. Most will take a piece f cold rolled steel and use that to plug a hole. Unfortunately, 4140 and 1018 are different steels, and will take bluing differently, 1018 will tend to be darker when blued. The other issue is the HAZ or Heat Affected Zone when welding. 4140 is a thru hardening steel, 1018 is a case hardening steel, not enough inherent carbon to self-harden. When welded, the 41 series steel will be hard, the 1018 steel will be soft. This HAZ, will not only show up when blued, but also when polished. Using the same grit, the softer steel will show the polishing lines more prominently than the hardened HAZ area.

I have found using like steels when plug/welding really helps, and on parts that can be.. annealed after welding to remove the HAZ. But in the case of barrels… nearly impossible.
_________________________
Mike Hunter
www.mikehunterrestorations.com

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#582289 - 10/19/20 08:32 AM Re: Un-doing holes [Re: rocky mtn bill]
battle Offline
Sidelock
**

Registered: 06/23/02
Posts: 1779
Loc: Versailles
Kutter…

Damn good work.

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#582332 - 10/19/20 10:49 PM Re: Un-doing holes [Re: Kutter]
Craigster Offline
Sidelock
**

Registered: 07/30/08
Posts: 419
Loc: humboldt
Amazing work there, Kutter.

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