You don’t want more than 2.5% CO2. You can use this as a 2 component mix with Argon or if you like you can use 2.5% CO2 mixed with varying amounts of Argon and Helium (dependant upon material thickness)
People use to use Argon + 2% O2 but to be honest, it’s not very good
Try increasing your travel speed. If you are welding with 1.2mm wire you will have a large weldpool with a lot of molten material which, as said above, is probably flowing downhill and getting in front of or underneath the end of your wire
To be honest, vertical down MAG welding is only suitable...
The choice of gas is more to do with the mechanical strength of the completed weld (carbon pick up etc) than the cosmetics. We supply gas to most of the commercial exhaust manufacturers and the majority use an argon +2.5% CO2 min with no oxygen
As with most things, do what works for you on that particular application
There is a world of difference between welding up a rusty gatepost and a critical component in a nuclear reactor, both are important but a totally different set of rules and skill sets apply
I was always taught to push above 3mm and that is what we teach in our training school but at the end of the day it seems to be down to personal preference
Don’t spray anti spatter into the actual weld joint, it needs to be on the plate where the spatter is landing
Tune the parameters in so that you are in spray transfer and you shouldn’t get any spatter
Your gas flow is way too high, provided you are working in an environment that is free from...