13 years ago
Of all the welding processed that we tried, we are now on GMAW. I had
full two hours to practice. The welding machine was a digital Lincoln
MIG welder the size of a Millermatic 250.
I was pleasantly surprised how it lets me make nice looking welds
(relatively speaking) without too much practice.
I set the machine in full accordance with the diagram.
Then I tried making a inside corner weld, which looked fairly decent,
using 1/4" plates and (IIRC) 320 IPM of 0.035 at 19v.
Then, recalling Gunner's infamous tire holder incident, I took it to a
anvil and pounded on this weldment, trying to flatten it.
To my disappointment, this solid looking weld failed in several
places, obviously revealing no fusion at all in those places. The
assembly held because in other places, the weld did not fail,but it
was not what I would call an encouraging experience.
I am not complaining, as such, the instructor told me that I should
have chosen different settings, etc and I am sure that he is
right. But, I think, given my low skill etc, I would not trust MIG
with anything critical.