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Old 10-28-2019, 08:57 PM   #1
doug.nichols
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Smile Rear Spring Perch - Welds

I have the rear end out of my '29 to install an overdrive and am trying to understand what I see with regard to the spring perches. In reading prior threads I understand it may have been common to weld and re-drill the perches. Is that what the attached picture looks like to you all?
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File Type: jpg Rear Perch.jpg (79.8 KB, 142 views)
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Old 10-29-2019, 01:10 AM   #2
Chuck Sea/Tac
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Default Re: Rear Spring Perch - Welds

Yes, but a butchered job.you possibly could grind it down and redo?
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Old 10-29-2019, 08:12 AM   #3
Ranchero50
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Default Re: Rear Spring Perch - Welds

seems the heat stresses would weaken the part versus strengthen it.
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Old 10-29-2019, 09:33 AM   #4
Joe K
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Default Re: Rear Spring Perch - Welds

Quote:
Originally Posted by Ranchero50 View Post
seems the heat stresses would weaken the part versus strengthen it.
Yes and no. The issue is more one of "cracking" inherent to the weld itself. Inclusions can cause this (AC welders are prone to this) as can bad technique with a standard stick welder.

MIG is my welding of favor. MUCH more inclusive weld and no inclusions from the shield material/substance. Many use TIG for the first pass to get the most inclusive weld possible.

With proper pre-heat, checking as you go along with dye penetrant, and proper interpass temperature there should be NO cracking. Actually with 7018 filler/rod, your weld will be stronger than the original metal.

I think a "re-do" is warranted though. A lot rides on that support.

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Old 10-29-2019, 11:48 AM   #5
Tom Endy
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Default Re: Rear Spring Perch - Welds

A local Model A repair shop here in Southern California repairs worn spring perches by inserting a bronze rod the same size as the bushing and then filling in the worn void with weld. The weld won't attach to the bronze.

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Old 10-29-2019, 11:56 AM   #6
Oldbluoval
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Default Re: Rear Spring Perch - Welds

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Tom
I sorta do the same thing but use gouging rods made of carbon. That way if anything gets stuck I can break it out
I think they are 3/4 (maybe 7/8) and I get them from McMaster Carr
But be awhile since I bought any.
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Old 10-29-2019, 05:33 PM   #7
rotorwrench
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Default Re: Rear Spring Perch - Welds

Copper rod it good too if you can find some. I've used copper for weld back ups quite a few times. I avoid using too hard a filler material. It makes it more brittle than it was originally.
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