At Thermal Spray Depot we are proud to be a distributor for the AT 400 twin wire electric arc spray system manufactured by Thermach. We have been asked if the AT 400 by Thermach is the same as the BP400 built by Praxair Tafa; well it is not, but they share an interesting  history in arc spraying.  In applications where you require electric arc for your metal spray application, the AT 400 is superior to the Praxair Tafa BP 400.

The BP 400 was originally designed in Wisconsin at Miller Thermal Spray, which was part of Miller Welding at the time. Through various acquisitions, the Miller Thermal Group became part of Praxair.  When Praxair purchased Tafa, they decided to move the manufacturing of the Miller Thermal Spray equipment to the north east.  The original design group and manufacturing group of Miller Thermal decided to stay in Wisconsin and form what is now Thermach.

Before Miller Thermal was sold, the design group was ready to implement significant improvements to the BP 400; but it moved before the improvements were made.  One of the first design projects that Thermach implemented was the redesign of their arc unit and created the AT 400. Both units look similar, but there is significant internal changes to the AT 400 that make it superior to its older sibling.

To see the superior features, please click on this link:

AT 400 Twin Wire Electric Arc Spray.

Keep asking questions!

Bob