4.0 rods question

GERMAN ROCKS

have a box of 4.0 rods here in the hot press with the last three years that I bought by accident. anyway I have some 6mm (thick) box iron that I want to weld into 100mm(thick) channel iron. would I finally get a use for these rods. are they suitable for this job and at what amps should they be run at roughly? its an oil welder so options are only 90, 110, 130 etc

dohc turbo2

Welders can vary , I've used some old oil welders and there savage stick machines , ur best bet is to try a sample bit first , easiest way cause , I've a few welders here and there all different

Cavanjack

GERMAN ROCKS wrote: »

have a box of 4.0 rods here in the hot press with the last three years that I bought by accident. anyway I have some 6mm (thick) box iron that I want to weld into 100mm(thick) channel iron. would I finally get a use for these rods. are they suitable for this job and at what amps should they be run at roughly? its an oil welder so options are only 90, 110, 130 etc

Ive used these many times but only on heavy plate (12mm up) on long runs. You'd be better off with a standard 3.25 rod for what your talking about welding.

GERMAN ROCKS

Cavanjack wrote: »

Ive used these many times but only on heavy plate (12mm up) on long runs. You'd be better off with a standard 3.25 rod for what your talking about welding.[/QUO

could the 4.0 rod blow through? or what is the danger

Zr105

You could use them, but you'll need fair power to burn them really which could lead to 6mm wall burning through. 3.2's will do fine for most stuff up 10-12mm so long as you take time and make sure they burn in right,
The 4's are just handier for filling heavy welds into 10mm up plate where you've a decent bevel as you'd eat through 3.2's

Cavanjack

GERMAN ROCKS wrote: »

Cavanjack wrote: »

Ive used these many times but only on heavy plate (12mm up) on long runs. You'd be better off with a standard 3.25 rod for what your talking about welding.[/QUO

could the 4.0 rod blow through? or what is the danger

No real danger but yeah could blow through. They are a bit cumbersome for welding a bit of box and channel. You could try it surely but they are more suitable for something like a digger bucket where you need big heavy fillets. Very awkward welding inside channel with a heavy rod. Likely to get slag traps.

GERMAN ROCKS

Cavanjack wrote: »

GERMAN ROCKS wrote: »

No real danger but yeah could blow through. They are a bit cumbersome for welding a bit of box and channel. You could try it surely but they are more suitable for something like a digger bucket where you need big heavy fillets. Very awkward welding inside channel with a heavy rod. Likely to get slag traps.

thanks. would 3 passes of a 3.2 rod be more effective so.

Cavanjack

GERMAN ROCKS wrote: »

Cavanjack wrote: »

thanks. would 3 passes of a 3.2 rod be more effective so.

They would indeed. You'll put the 4mm to good use some other time.

patsy_mccabe

I use 3 passes of the 2.6mm rods myself for the bit I do. Work away on a 13Amp fuse, no bother.

st1979

You need 160-200 amps for 4.0mm rods. Much faster than using 3.2mm It normally says what amps on packet. Its also on my new welders manual. Would work well on 6mm steel