STEVE/ US ALLOYS

What you need to look at is the AWS classification. This will come very close to describing the uses and characteristics of the filler metal you need. Not all identically classed wire is equal, however.

You will most likely require a wire that will make multiple passes in less than ideal conditions at times amd if the wire is of a general purpose variety it's range of use will be more beneficial to you. I imagine the "innershield" wire is an open arc wire of the T-3 or 4 variety. The T-3 is limited to 1/4" thick metal and single pass only. It is also limited to the flat and horizontal positions. The T-4 is a low penetration wire electrode for flat and horizontal positon but can be multipassed.

An E71T-1 will run single or multiple passes in flat, horizontal, vertical up, and overhead positions. It requires an external shielding gas of CO2 or Ar/Co2. It is used extensively in structural steel welding and on earth moving equipment.

There are new wires that are not described by the AWS. Many of these bear the description of AWS "G" or "GS" wires. Only the manufacturer of these wires can give you the proper parameters and so forth. Some of these are high deposition wires and some are not. You may find one of those that works very well but which one is best can only be determined impirically I'm afraid.

IMHO the E71T-1 is something you can get along with in as much as the commodity type wires are concerned. Steve

If I read your post right, you are using a CC machine for the power source. This is going to be at least 85% of your troubles. CC and flux core don't mix well at all. You can get away with some work in the flat and OH positions but forget about verticals completely. You need a good CV machine or flip the truck on it's side.

Like I said before, you can get by running wire on a CC machine but it is serverly limited in application. If you don't do a lot of wire work that would justify dropping $11000+ on a new welding machine, then you are better off just getting a decent big bore stick electrode and go that route. With the machine you have, you should have no trouble running a good 3/16" or 7/32" XX18 stick to get the deposition rate you need to keep the time down.

The E-71T-1 should be the AWS designation for the wire your supplier mentioned.

That LN-7 is obsolete now. I'm not sure you can get any options for it still. I happen to have the last manual that Lincoln had in their possesion for the LN7.
Steve