Welding is often an important part of manufacturing of metals and frames, many parts and assemblies are welded together before it is checked for accuracy and fit. There are lots of different forms of processes that can be used for welding other than the gas flame most of us recognize that too, laser, electrical arc, electron beam and friction.
Powder welding type of coating technique is generally applied to create a hard finish on metals, since it allows the flexibility to apply in different layers.
Powder welding is a popular welding technique, which uses specially designed torch oxyacetylene for welding. The powder is introduced into the gas stream integral dust hopper and then transferred to the work piece through a flame. A puddle torch is the welding torch powder using a standard torch oxy-acetylene, with the powder feed the flame of a hopper attached. Normally used for glass molds, small parts and repairs.
Flame spraying is part of a broader process known as thermal spray coating. In these processes, powder consumables are heated and propelled onto a substrate to form a layer.
Flame spray is the oldest thermal spraying processes. Today there are a variety of products that can be used for protection against corrosion and wear. Thermal spraying is a process where liquid is sprayed or powder to form a layer on the metal. Laser cladding is another process used for coating where laser is used to deposit the material.
Types of thermal spray include HVOF (high velocity oxygen fueled), plasma spraying and others. Hard facing is another procedure that increases the wear resistance of a metal in a hard material is welded to the base metal to increase the life of the metal.
PTA is a hard coating process arc welding and is considered the further development of tungsten inert gas (TIG) process. It looks similar to that of plasma spraying but offers many more advantages over the same.
