Bladder and Tank Seamer From the innovators of welding automation, Miller Weldmaster presents the BT2000. Designed to increase tank and bladder production while dramatically reducing labor. Our exclusively designed BT2000 welding heads enable the operator to weld overlaps and top and bottom tape covers, all in one pass. The three seams at one time makes the BT2000 the leading choice for tank and bladder makers worldwide. The low ground construction enables you to construct your tanks using your floor. This unique design reduces floor space while eliminating material handling. For the fastest most efficient means of tank and bladder construction... The BT2000.