Has anyone done much pipe welding with the Ranger 250? I thought I could weld pipe as I have never had any burn through issues in the past. Since I bought my 250 I can not lay a root to save my life, and it seems that the amps jump all over the place. Granted I am used to a Bobcat but it shouldn't be this much different. Any info would be a huge help as I am about ready to sell this and buy something else.