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From: David Billington <djb@invalid.com>
Newsgroups: sci.engr.joining.welding,rec.crafts.metalworking
Subject: Re: 309SS or ER70S6
Date: Tue, 23 Jul 2024 16:55:55 +0100
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On 23/07/2024 16:12, Snag wrote:
> On 7/23/2024 8:29 AM, Jim Wilkins wrote:
>> "Snag"  wrote in message news:v7o9n9$17apc$1@dont-email.me...
>>
>>    My neighbor has asked me to build up a worn spot on the drive pin of
>> his framing nailer . I'm not sure what model it is . The pin has wear on
>> the flat side at the tip , and it appears to be from sliding against the
>> head of the next nail in line . I'm considering using SS for better
>> abrasion resistance . The pin is not particularly hard , can be marked
>> with a file , but "mushrooming" in the repaired area is also a
>> consideration . Replacement pins are available ...
>
>   I decided to go with the ER70S6 , followed by case hardening . Turns 
> out it is actually quite hard as-welded - might actually need to be 
> tempered - so I skipped the case hardening . I'm waiting for a call 
> back from the neighbor since I kinda melted a sharp corner and it's 
> going to be a bitch to try to build up - this thing is only about 3/8" 
> in diameter with a flat on one side . I can cut that bit off if taking 
> off a sixteenth will be acceptable . Most of these nail guns have a 
> depth setting so I'm thinking it won't be a problem to shorten it but 
> I want to check with him to be sure .

If a spare part is available then I would use that unless prohibitively 
expensive. What sort of welder are you using. I refurbish glassblowing 
jacks occasionally using a TIG welder and O1 as filler and that leaves 
quite a hard deposit that I temper once built up to the required level. 
It's like welding on the edge of a blunt knife blade and worthwhile 
considering what new ones cost so long as they haven't worn so much it's 
beyond saving.