Welding Old Alloy

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Bob.Murphy
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Re: Welding Old Alloy

Postby Bob.Murphy » Thu Jan 09, 2014 11:26 am

Knud.Degnbol wrote:I have been inspired by your story. I have an Ariel model A with the same gearbox, which have a worn bush for the kickstart. I might need to do the same to that.
Knud


Knud,

You will have to be careful when machining the thread in the gearbox cover - there are two steel 'stops' in the back - meaning that you have to stop the threading tool just as it clears the alloy:


Image


Unfortunately, my lathe doesn't have a clutch so I have to judge when to turn it off and then grab the chuck with gloved hands to stop it :shock: .

It doesn't always work and I ruined at least one threading tool :x .

I turned-up a threaded mandrel that screws into the face plate (mine is a 'Boxford-Type' lathe with a 1.5" BSF thread (8 TPI)). I then turned half of it down to exactly fit the original kickstart sleeve.


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This allowed me to accurately centre the end cover on the faceplate before bolting it down.


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It also gave me a method of checking that the new sleeve was concentric with the cover. My first attempt was slightly 'off', the second one was fine :roll: .


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I turned the original kickstart shaft bearing out of the shaft - it is 'stepped' so go carefully!


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The new one was turned out of bronze tube (expensive stuff :shock: ) and then pressed in.


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I don't claim to be a great Machinist - but I'm learning. If I can help at all just give be a shout ;)

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH

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Postby BarryDavies » Fri Jan 10, 2014 7:28 pm

I got myself a kit for low temperature welding aluminium etc. It works half way between soldering and welding, closer to brazing. It is called a 'Lumiweld' kit, from LB Restoration Services, Bodmin.
If it is as good as advertised then it will be a cheap and safe way to repair ally

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Bob.Murphy
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Re:

Postby Bob.Murphy » Sat Jan 11, 2014 11:49 am

That sounds interesting Barry, I'll look into that.

Do you have plans to use it in the near future - it will be interesting to hear how well it works ???

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH

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Bob.Murphy
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Re: Re:

Postby Bob.Murphy » Sun Jan 12, 2014 11:46 am

Well, I bit the bullet and ordered a 'Lumiweld kit' - 20-rod version (a guy just can't get too much practice :lol: ).

I'll let you all know how it works ;) .

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH

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Re: Welding Old Alloy

Postby Knud.Degnbol » Sun Jan 12, 2014 10:13 pm

Fine Photos. My advance planning is much easier now.
Knud

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Postby nevhunter » Mon Jan 13, 2014 1:48 am

Before TIG Al used to be welded with an oxytorch but it was a true weld. The filler was similar to the parent metal. The problem with Aluminium is that the surface forms an oxide almost instantly and a flux or gas shield (inert) is required.
Lower temp rods Melt below the parent METAL) would be a form of soldering ( similar to brazing IN PRINCIPLE which is high temp solderingin a fashion). There was a torch called a Dillon which does good welds and may be something like what you propose. Nev

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Re:

Postby Bob.Murphy » Mon Jan 13, 2014 11:03 am

nevhunter wrote:There was a torch called a Dillon which does good welds and may be something like what you propose. Nev


I don't have much information on the 'Lumiweld' product. The kit was only £28 so I thought it worth a look. I don't know what heat source is used.

I have Butane and Propane torches and can lay my hands on an Oxy-Acetylene rig if necessary, plus I have a stick welder that can be used with various torches to produce arc heating.

I will see what turns-up, then get practicing.

Bob.
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Postby nevhunter » Mon Jan 13, 2014 11:21 pm

Very few people weld aluminium with oxy these days, but done well it is quite satisfactory. You must avoid flux inclusions. You use a lot of flux to keep it from oxidising. Practice on scrap pieces. Preheat and cool carefully or you will crack it .Nev

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Re: Welding Old Alloy

Postby wade.edwards » Mon Jan 13, 2014 11:57 pm

For pre weld cleaning of oily alloy I would recommend sending the part for vapour blasting which does a good job of pore cleansing.

Have always wondered what the ideal oven temperature would be to pre heat?

What is your address Bob? I am sending over a box of bits for machining. :lol:

Wade

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Re: Welding Old Alloy

Postby Bob.Murphy » Tue Jan 14, 2014 12:08 am

wade.edwards wrote: What is your address Bob? I am sending over a box of bits for machining. :lol:
Wade


I wouldn't :roll: . . . This afternoon I was cutting 26tpi threads on long studs and managed to snap my 55deg threading tool - classic case of trying to cut too deep on the third pass.

I don't claim to be any sort of expert :oops: .

;)

Bob.
My avatar shows the late Len Rich in 1970 with the bike I now have - a 1958 Ariel VH


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