The "LVM" designation only means that it is a Vacuum Arc Remelted material meeting all the requirements of a 316LS. If you are using the TIG process and using a 316L TIG wire you should not have any problems. The characteristics should be the same. Silver solder will not work. What do you mean "it can't be welded using TIG"? The 316LVM rod and the 316 tube have the same nominal chemistry except the straight grade 316 has a slightly higher carbon content, which will not affect the weldability. Please explain what you are experiencing.

Chuck