Hobart Tri-Mark Triple 7

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I have been running Hobart Tri-Mark Triple 7 dual shield for a while. Very happy with it. I've been running it with 75/25 because that is how I was already setup. The weld appearance has been great and it wets out very nicely. I've been thinking about running 100% CO2 to save money. What kind of appearance difference should I expect? Looking at the spec sheet it appears to be shielding gas indifferent.http://www.hobartbrothers.com/upload...ts/Triple7.pdfAlso, has anyone run it with 90/10? The spec sheet doesn't list it being that this is an all position wire. Just curious what the results were really cranked up.
Reply:Forhire,The AWS class for Hobart Triple 7 indicates it's an all position wire.  E71T1; the 1 as the second digit means all position capable.  a 0 would indicate flat or horizontal only.You should expect more spatter and a hotter puddle with 100% CO2 and a T-1 fluxcored wire; which might require slightly different settings for vertical up welding.  Look closely, the settings on the datasheet were arrived at by testing with 100% CO2.  Add one volt for mixed gas.Running that wire with 90/10 gas mix might work, but will affect the weld metal chemistry and resulting mechanical properties.  You could see changes(read a loss) in weld deposit toughness.  If you must use 90/10 I suggest you call Hobart customer applications line and see if they have any data from past testing using 90/10.  In my experience using a higher Argon gas mix makes for a hotter arc, which in turn means a more fluid puddle good for flat welding; not so much for vertical or overhead positions.Benson's Mobile Welding - Dayton, OH metro area - AWS Certified Welding Inspector
Reply:Originally Posted by A_DAB_will_doForhire,The AWS class for Hobart Triple 7 indicates it's an all position wire.  E71T1; the 1 as the second digit means all position capable.  a 0 would indicate flat or horizontal only.You should expect more spatter and a hotter puddle with 100% CO2 and a T-1 fluxcored wire; which might require slightly different settings for vertical up welding.  Look closely, the settings on the datasheet were arrived at by testing with 100% CO2.  Add one volt for mixed gas.
Reply:Originally Posted by MinnesotaDaveTypo? Generally subtract 1 volt for mixed gas.
Reply:I run .045" E71T1 with 100% CO2 at work. It runs pretty well once you get the settings figured out but can be a real spatter mess if you're off on the settings. I don't have a comparison to mixed gases because I've only run it with CO2. I have mine setup to run a 1/4" - 5/16" fillet, just straight push or pull, no weave, and the weld profile is good, flat face and toes are smooth transitions. It welds just like 7018 going uphill. Make sure you leave a longer than normal stickout for best results. As a side note, I always see how far from the bottle I can get the hose to frost over, it's how the boss tracks my progress.
Reply:Originally Posted by MinnesotaDaveTypo? Generally subtract 1 volt for mixed gas.
Reply:Originally Posted by forhireI suspect it's a typo. The spec sheet indicates subtracting a volt. I think your correct. Yeah, I waited on hold a week ago because curiosity had the better of me. I must have called at lunch time... I finally just gave up waiting and hung up. Weld chemistry makes a world of sense. I don't normally deviate from the recommendation. It was curiosity... nothing more... than if someone has tried it in the flat position. My main point to to learn how the appearance might vary. I had assumed more splatter but with the cost of CO2 about a third of mix it makes it pretty darn attractive. I didn't want to setup for CO2 and then not like the appearance. I'm sure someone has run both. Dual shield is expensive enough... looking to save some dough.
Reply:Originally Posted by burnsAs a side note, I always see how far from the bottle I can get the hose to frost over, it's how the boss tracks my progress.
Reply:Just to be clear, while the settings can be a bit finicky at times, once you get it set and know your settings you can make spatter free welds all day long. When I first started at the shop I had never used FCAW and the results of the person training me were horrible. I just loaded both machines with hardwire, one .035 and one with .045, and never thought about it too much. One day I decided to figure it out and after a few hours jacking around had a pretty good handle on it. The more work I do with it the better it gets and now my welds are looking pretty sporty. I purchased an air chisel which makes any cleanup much faster. I tend to get large balls of spatter, if anything, and the air chisel, if you're paying attention, doesn't even leave a mark. It only takes seconds to cleanup anything along your weld. Also, welding uphill is much faster not having to change out a rod every 5"-6".