Welding a Hardened Pin

[Martin Brody]

Hi folks, I am hoping that someone can advise me on something I need to do to repair a piece of machinery.

I have an old (1990's) machine that I am slowly refurbishing when I get a bit of time. The next job is to replace a particular pin and bushing. The bushing is available for less than £10 but the pin is only available form the OE manufacturer for the cost of £490. The pin is 1.75" in diameter with a welded on plate at one end through which a bolt passes to retain the pin in place. There are lots of similar pins available with the same diameter, but without the welded plate, for various other machines for less than £25.

What I want to do is buy a plain pin and then weld a retaining plate to the end of it. My question is, is it OK to weld these types of hardened pins and if so what filler/technique would you suggest? I have Stick, MIG and TIG available to me.

Here is picture of a similar (ish) type of pin taken from the web to illustrate what I mean.

Thanks

Martin

 

[Brad93]

Hi folks, I am hoping that someone can advise me on something I need to do to repair a piece of machinery.

I have an old (1990's) machine that I am slowly refurbishing when I get a bit of time. The next job is to replace a particular pin and bushing. The bushing is available for less than £10 but the pin is only available form the OE manufacturer for the cost of £490. The pin is 1.75" in diameter with a welded on plate at one end through which a bolt passes to retain the pin in place. There are lots of similar pins available with the same diameter, but without the welded plate, for various other machines for less than £25.

What I want to do is buy a plain pin and then weld a retaining plate to the end of it. My question is, is it OK to weld these types of hardened pins and if so what filler/technique would you suggest? I have Stick, MIG and TIG available to me.

Here is picture of a similar (ish) type of pin taken from the web to illustrate what I mean.

Thanks

Martin

View attachment 392875

You just make them out of en16 and use normal rods/mig welder.

no need to harden.

 

[Martin Brody]

You just make them out of en16 and use normal rods/mig welder.

no need to harden.

Thanks. JCB 3CX bucket pins are £20 each +vat and I was planning on using one of those (my machine is not a 3CX but 3CX pins are very common hence why they are cheap).. I guess I could buy some EN16 and use that.

So are we saying that one cant weld something like a bucket pin?

Martin.

 

[Brad93]

Thanks. JCB 3CX bucket pins are £20 each +vat and I was planning on using one of those (my machine is not a 3CX but 3CX pins are very common hence why they are cheap).. I guess I could buy some EN16 and use that.

So are we saying that one cant weld something like a bucket pin?

Martin.

They'll weld fine

 

[Martin Brody]

They'll weld fine

Thanks. Do you happen to know what this type of pin is commonly made from?

Would you suggest pre-heat or just ambient temperature?

Martin

 

[Brad93]

Thanks. Do you happen to know what this type of pin is commonly made from?

Would you suggest pre-heat or just ambient temperature?

Martin

Depends if they are case hardened or through hardened.

EN9, EN16, EN24T, EN36B

Take your pick.

EN16 is very tough, good to machine.
EN24 is seriously tough, can be through hardened, but could become brittle in some situations after use.
EN36 has a tough soft core and a hard outer layer once hardened.