Hi Guys, found this forum a week ago and it's great.
My welding isn't though ! It's occasionally ok, but I am getting nowhere trying to weld a 1mm thick bracket onto the underfloor channels on my car, which are about 1.5mm thick. I drilled 8mm holes in the bracket to 'spotweld' them on, I fill the bracket holes beautifully but one tap and off they come. Not a mark on the channel. Yes, they are really clean !
Have got a Cosmo 130 gas/gasless (mistake no 1). The bloke who welds car car (he's got a Parweld thing) tried my welder and said it is cr*p and the wire seems to feed too fast. I am using 0.8 and a Sealey refillable CO2 bottle.
On this forum there is a useful chart on currents etc for different thicknesses which was very interesting.
One useful thread actually explained the 3 switches on the front - I never understood that one !
To help me understand my cr*p welds, I read a few subjects on the Cosmo, and wire feed rate came up - generally too high.
So I did some tests. With 0.8mm wire, this is what kicks out in 10 seconds, wire feed knob in the middle :
Low - Min : 0.87M
Low - Max : 1.70M
High - Min : 1.80M
High - Max : 2.8M
Then tried the lowest wire feed setting :
Low - Min : 0.76M
Low - Max : 1.05M.
One good point - the wire feed isn't slipping ? !
Do these 'open load' wire rates seem too high ?
I read a 'project' that a guy did on his SIP 130 (this is the same ?), he modded the wire feed circuit by swapping the trimpot.
I am ok on electronics and can do this if you guys reckon the wire is feeding too fast.
As a second question (cheeky) - when do you use 0.6mm and when 0.8mm ?
I don't think the Cosmo knows what you have fitted, so how does this bit work ?
My welding isn't though ! It's occasionally ok, but I am getting nowhere trying to weld a 1mm thick bracket onto the underfloor channels on my car, which are about 1.5mm thick. I drilled 8mm holes in the bracket to 'spotweld' them on, I fill the bracket holes beautifully but one tap and off they come. Not a mark on the channel. Yes, they are really clean !
Have got a Cosmo 130 gas/gasless (mistake no 1). The bloke who welds car car (he's got a Parweld thing) tried my welder and said it is cr*p and the wire seems to feed too fast. I am using 0.8 and a Sealey refillable CO2 bottle.
On this forum there is a useful chart on currents etc for different thicknesses which was very interesting.
One useful thread actually explained the 3 switches on the front - I never understood that one !
To help me understand my cr*p welds, I read a few subjects on the Cosmo, and wire feed rate came up - generally too high.
So I did some tests. With 0.8mm wire, this is what kicks out in 10 seconds, wire feed knob in the middle :
Low - Min : 0.87M
Low - Max : 1.70M
High - Min : 1.80M
High - Max : 2.8M
Then tried the lowest wire feed setting :
Low - Min : 0.76M
Low - Max : 1.05M.
One good point - the wire feed isn't slipping ? !
Do these 'open load' wire rates seem too high ?
I read a 'project' that a guy did on his SIP 130 (this is the same ?), he modded the wire feed circuit by swapping the trimpot.
I am ok on electronics and can do this if you guys reckon the wire is feeding too fast.
As a second question (cheeky) - when do you use 0.6mm and when 0.8mm ?
I don't think the Cosmo knows what you have fitted, so how does this bit work ?