Welding

ronsealdeath · Jan 13, 2015

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Discokids · Jan 14, 2015

top drive said:
Is it Really worth ####ing about unless you have all the stuff for free and a cheap co2 supply..... when you can get a hobbygas cylinder of argoshield filled for 40 quid and do the job right

I did only go down this route as I get the extinguishers for nothing and my reg was cheap. (and I didn't know any better!)

top drive · Jan 14, 2015

thats my point though. if you have the stuff to repurpose then fine.

but spending good money to end up with a mediocre solution seems madness when for slightly more you can have the real deal.

Discokids · Jan 14, 2015

Yes I agree, just wanted to make it clear that while its a good cheap solution it's not the best. I wouldn't buy in the extinguishers. I'm interested in this 'co2 makes brittle welds' claim, my mate/teacher/father figure has used it for years, probably over 20, welding up all sorts from classic fords to hgv chassis. No problems yet. Or would this brittleness (is that a word?) only rear its head in an impact/collision?

Saltlick · Jan 14, 2015

or is it just an internet myth with circular references?

chris7 · Jan 14, 2015

If the weld is too brittle it will crack as soon as the welded piece is put into use, or before as it cools,which is why it is good practice to leave a small gap every so often when doing a run! Kind regards. Chris

Thor1950 · Jan 14, 2015

Discokids said:
Yes I agree, just wanted to make it clear that while its a good cheap solution it's not the best. I wouldn't buy in the extinguishers. I'm interested in this 'co2 makes brittle welds' claim, my mate/teacher/father figure has used it for years, probably over 20, welding up all sorts from classic fords to hgv chassis. No problems yet. Or would this brittleness (is that a word?) only rear its head in an impact/collision?

Just disregard what I said, does not apply in this application of welding thin metal.

marccleave · Jan 14, 2015

Thor1950 said:
Just disregard what I said, does not apply in this application of welding thin metal.

Okay, lets talk about welding thick metal then. What do you call thick?

What causes welds to become brittle when welding thick metal?

Discokids said:
I'm interested in this 'co2 makes brittle welds' claim

As am I... but as of yet, no proper response.

ronsealdeath · Jan 14, 2015

Proper argon co2 o2 mix gives a neat weld compared to co2. Co2 merely gives a bead that sits prouder from the piece. Thus argon mix looks better but is prob similar strength as co2

marccleave · Jan 14, 2015

retracted awaiting explanation

chris7 · Jan 14, 2015

Just a further note on welds that are prone to crack! For even with excellent penetration! If there is any UNDERCUTTING on top , which is a groove on both or either sides of a weld, under STRESSED conditions the joint may crack! This applies to any thickness of metal being welded! Kind regards. Chris

pressbrake · Jan 14, 2015

marccleave said:
Yes argon/co2 mix will reduce spatter and give a neater weld. But 100% CO2 will produce more heat and give more penetration. So it could be argued it would be stronger.

no

marccleave · Jan 14, 2015

pressbrake said:
no

Explanation please?

Thor1950 · Jan 14, 2015

marccleave said:
retracted awaiting explanation

be gone just got back.

Thor1950 · Jan 14, 2015

marccleave said:
Okay, lets talk about welding thick metal then. What do you call thick?

What causes welds to become brittle when welding thick metal?:

Improper joint design or root opening, different base metal to filler wire/rod( dissimilar metal) . Improper pre heat, inter pass temp and post heat. welding to low of heat setting, or using to much heat and burn the carbon or alloy out of base metal. Cooling of the steel to fast when finished. This is just for starters

Discokids · Jan 14, 2015

Proves I know f@$& all about welding!

marccleave · Jan 14, 2015

Thor1950 said:
Improper joint design or root opening, different base metal to filler wire/rod( dissimilar metal) . Improper pre heat, inter pass temp and post heat. welding to low of heat setting, or using to much heat and burn the carbon or alloy out of base metal. Cooling of the steel to fast when finished. This is just for starters

Okay let me make it slightly more clear.

Why does using 100% CO2 when MIG welding cause brittle welds? What is it specifically that the CO2 does or doesn't do?

gemsdad · Jan 14, 2015

marccleave said:
Okay let me make it slightly more clear.

Why does using 100% CO2 when MIG welding cause brittle welds? What is it specifically that the CO2 does or doesn't do?

give him chance to google it please.

op2:

he has left the thread,looking in another one.so no reply.

marccleave · Jan 14, 2015

gemsdad said:
give him chance to google it please.op2:

he has left the thread,looking in another one.so no reply.

Yes... very good at avoiding answering the actual questions at hand...

gemsdad · Jan 14, 2015

marccleave said:
Yes... very good at avoiding answering the actual questions at hand...

no change there then.Him being a welder

as well.

Welding

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