Which filler rod for EN19T to cast steel?

[Nige]

Many years ago I had some roll centre correction pins made for my track car. They have been used since with no issues, but I've replaced the hubs and am having a couple of new pins made from EN19T.

The hubs are cast but weld nicely without many contaminants.

I can't for the life of me remember what filler rods I bought. I know I got some specifically for this weld, but that's all.

What rods do I need? I don't need 5kg, literally a couple of rods will be sufficient.



Before welding the entire assembly was preheated

welded using the correct filler rods.

To reduce any micro movement the top of the pin and the slot was also welded

The pin fully welded in place and allowed to cool naturally.

 

[Brad93]

EN19 (4140 American equivalent) is known for its propensity for cracking at the best of times.

I'd think something like 309, 312 or high nickel percentage.

Preheat vital, slow cooling vermiculite or sand highly favourable.

 

[pressbrake1]

I’m uncomfortable above en16

 

[Brad93]

It can be done, 4140 is welded successfully in high pressure vessels and pipework regularly. Massive preheat and post weld heat treatment though.

600°C preheat in a chamber a pal of mine done. Serious money.

 

[Nige]

As I mentioned, these pins have been used on mine for years doing 10,000's of track miles along with many other vehicles as loads of these kits have been sold with zero failures.

Compared to the standard balljoint these are significantly stronger.

I'm happy with the pins, just after suggestions on which filler rod please.

 

[Tinbasherdan]

As I mentioned, these pins have been used on mine for years doing 10,000's of track miles along with many other vehicles as loads of these kits have been sold with zero failures.

Compared to the standard balljoint these are significantly stronger.

I'm happy with the pins, just after suggestions on which filler rod please.

That they might have done, but it only takes one failure to ruin someone’s day. Not sure most would be up for advising a half arsed measure, when you’ve been told the correct procedure and aren’t interested

 

[Brad93]

i'd contact the manufacturer and see what they recommend you use.
i certainly wouldn't want to recommend f anything knowing the consequences

 

[Nige]

What procedure have I been told and aren't interested in ?

I don't make the kits, I just bought it and fitted it to my car.
The manufacturer has been making these for years, but I know some people just grab a mild steel filler rod and use that and don't even preheat it.

I was hoping someone on here would be able to let me know what a more suitable filler rod would be that's all.

I can't remember what I used before.

 

[Munkul]

Er70/er80 filler will work fine... With correct preheat and post weld heat. Since you can't guarantee this, personally i would use 309 stainless as the amount of nickel in it helps resist cracking. I would still put a good pre heat on it, ideally 300 degrees, and let it cool very slowly, ideally under a heat blanket or something like that.

Note that you're entirely liable for your own fabrication here. This is just free advice, and it's worth exactly what you paid for it...

 

[Shox Dr]

Not sure about 4140.

But 4130 needs post heat treatment over 6mm

 

[Brad93]

Not sure about 4140.

But 4130 needs post heat treatment over 6mm

more or less the same

 

[pressbrake1]

Not sure about 4140.

But 4130 needs post heat treatment over 6mm

Enough of the yank codes! En or din please

 

[Nige]

Er70/er80 filler will work fine... With correct preheat and post weld heat. Since you can't guarantee this, personally i would use 309 stainless as the amount of nickel in it helps resist cracking. I would still put a good pre heat on it, ideally 300 degrees, and let it cool very slowly, ideally under a heat blanket or something like that.

Note that you're entirely liable for your own fabrication here. This is just free advice, and it's worth exactly what you paid for it...

Thank you.

I completely understand its free advice

 

[Shox Dr]

Enough of the yank codes! En or din please

I cant help it if the spec is for 4130 not T45. I did think I've used any english cromolly tube, always imported 4130