How strong is JB weld compared to cast aluminium by a tensile force?


How strong is JB weld compared to cast aluminium?
A broken lever from the quick snap from a "Supercut 2 Q" oscillating tool from "Fein".

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tobias.claren.9 (author) 3 months ago
I know that Fein sells replace Parts.

But that is not the question.
Repairing this broken part was the Question.
I could also call a welding shop that weld aluminium...
seandogue3 months ago

harsh but yu're probably not going to make that part woe again.

the saving grace is (or may be) that fein actually sells replacement parts...

harsh but **you're** .... make that part **whole**

It is thoughtful to include a link, but unfortunately, probably through no fault of yours, that link seems to pointing into nowhere.

Was it somewhere on Maybe:

hmm yeah, it was *supposed to be a pasted link I snagged from fein. I'm not sure why it didn't go through.

Sometimes I think this site has an engine with not all of its cylinders firing.

I also have lost links, failed to link, links I thought I put into the Instructables comment-editor.

There seem to be two ways to make the comment-editor insert a link.

One way is to select a blurb of previously written text. Then a little bar-shaped menu appears offering ways to modify that blurb, namely:

[(bold) (italic) (heading) (link) (quote)]

The other way seems to be to just paste the link at a new line, and then press <enter>, and that line turns into a link.

If the URL is short, the full text of the link is visible.

If the text of the URL is kind of long, the editor only prints the first, uh, maybe 50 chars of it, followed by ellipsis (...)

Anyway, I have kind of adopted the habit of just putting links into the body of the prose I'm writing, and the reason for this is because I have had links get lost, not linked, using the "link" button thing.

Also I have adopted the habit of writing most of my posts, in an external text editor, and then pasting that text into the Instructables comment-editor, and the reason for that is the external editor is less likely to lose, or garble, what I'm trying to write.

Downunder35m3 months ago

These "glues" work really well if you have enough area to work with.
You can't just snad the crack down and fill it.
If you can fill up the inside of the clip it might be strong enough though.
I would either try to order the replacement part or make a new one from cast aluminium using the old one as a template.

Jack A Lopez3 months ago

Would it be possible to fabricate a steel version of that part, with the tools you have?

Like maybe a hex nut welded to a piece of flat bar, to get the approximate outline of it, and then grind, or drill, to get the fine details?

The idea of doing this, with ordinary tools, without the use of a complete machine shop... I dunno.

It's not clear to me what level of detail is needed, because I do not have a good mental picture of what that part actually does. I am guessing the cylinder shaped part is some kind of cam, and moving this lever causes whatever is riding on the cam to move up and down.

I mean, my impression is the manufacturer should have made this part stronger, by making it thicker in places, or by making it out of steel.

iceng3 months ago

I would doubt your broken article is aluminum but rather pot metal mostly Zinc

It can be soldered see here with super alloy 1 which melts at only 350 and pot metal melts at 750 see how

Jack A Lopez3 months ago

I guess they don't make 'em like they used to. Uh... that is assuming they used to make them in first place.

I found a blurb on this page,

that says cured JBWeld(r), "has a tensile strength of 3960 PSI"

The Wikipedia page for, "Ultimate Tensile Strength" has a table, titled "Typical Tensile Strengths",

and in that table, there are two different aluminum alloys mentioned, with ulimate tensile strengths of, 483 MPa and 300 MPa.

So, I guess I want a conversion from PSI (pounds per square inch) to MPa (megapascals)

1 PSI = 0.0068948 MPa

From the Wikipedia article, titled "Pressure".

So 3960 PSI = (3960 PSI)*(0.0068948 MPa / PSI) = 27.30 MPa

From this simple calculation, it kind of looks like, aluminum alloy has greater tensile strength than JBWeld (r), by a factor of about 10. That is, roughly 30 MPa for JBWeld, versus about 300 MPa for aluminum alloy.

Somebody, should probably check my math, because I have been know to make mistakes on back-of-an-envelope stuff like this.