Other Welding Techniques Hot plate welding is a low cost technique for joints which are mechanically stressed in end use since the area of the weld can be very large. Surfaces to be joined are brought to temperature by contact with a non-stick metal tool and then welded together under controlled pressure. Complex joints in several planes can be made.
Productivity is slower than ultrasonic methods.
Spin welding depends on the parts being rotationally symmetrical. Another technique, but using expensive equipment, involving welding by frictional heat is vibration welding. This is used in large parts with joints in one plane.