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Wire speed is way too fast, you can see it in the welds, way, way too much wire in the weld.Originally Posted by nova_robotics
As for the saw blade, this is the same person who made a larger flat washer by taking the bearing seals off, sprinkling in metal shavings and adding super glue. It looks like this guy is one of those people that finds whatever to use in the build.
As for the CO2 generator, a simple calculation shows it to be way more expensive to produce that way. And - the pressure regulation is an innertube. A more constant delivery would be needed for welding. As the inner tube deflates, the pressure goes down. At the beginning, the pressure might be too high and then it is too low - bad for welding.
Now as for your car exhaust idea - that would be a problem. While there is a volume of CO2, your problem would be the H2O in the exhaust. Here is a good discussion of the chemistry of engine combustion:
https://www.eng-tips.com/viewthread.cfm?qid=104735
In the exhaust, you also have lots of N2 flowing, since it is a major component of air. There is a school of thought that Nitrogen, being inert, could replace Argon in the shielding gas, so that part is useful, but your problem is going to be the water. Water in simple MIG welding is a source of Oxygen and Hydrogen (it is easy to convert water to H2 and O with the plasma arc) and both O2 and H2 are bad for weldments. Hydrogen causes delayed cracking also known as cold cracking and when embedded, it causes Hydrogen to be deep in the weld. As for the Oxygen in the shielding gas, while it can have a beneficial effect in small amounts, the combustion equation looks like the water in the output is a fairly high concentration and the various sites say in higher concentrations, O2 promotes combustion and uncontrolled oxidation.
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