Heat Treatment Services
Post Weld Heat Treatment Services ( PWHT ) is defined as one of the heat treatments done after welding/machining to improve the Chemical mechanical properties of weldment / machined surfaces.
Post weld heat treatment reduces the residual stresses formed during welding. It also restores the macro structures of the steel. PWHT requirements are to be strictly followed in high-pressure applications to avoid component failure.
PWHT eliminates the effects by heating, soaking & cooling the weld area in a controlled manner to a temperature below the first transformation point, giving the macrostructure sufficient time to readjust to its original state & removing the residual stress.
BCTS offers Heat treatment services such as Preheating, Post heating, stress relieving, normalizing, solution annealing, hydrogen diffusion, intermediate stress relieving, tempering, etc. BCTS provides post-weld heat treatment by using electricity as the source of heating for stress relieving of weld joints as well as also uses diesel fuel as a source of heating for stress relieving for pressure vessels. Our heat treatment services are designed to minimize downtime, improve structural integrity, and enhance effective plant life. Additionally, depending on the mobility of the required equipment, many of our heating processes can be applied on-site or at your facility.
Internal Heating Method
Jobs such as Horton Sphere, Mounded Bullet, Thin Wall Tank, LPG Bullet, Columns, Pressure Vessel, and Penstock can be heated by an internal heating method using gas, oil-fired burner system. Other jobs, which required refractory dry out and coating curing, can also be performed using the internal heating method.
Temporary Furnace Heating Method
The Pressure Vessel, LPG Bullet & Structural in bulk quantity can be heat treated in permanent or temporary furnaces using electrical Resistance/Induction Heating, gas or oil firing method.
Local Electrical (Resistance/Induction) Heating Method
Various pipes, circular seam joints, heat exchangers & structural jobs of intricate shape can be heated treated-using electrical Resistance/Induction heating methods. BCTS has specialized personnel and equipment to carry out a wide range of heat treatment processes like post-weld heat treatment of vessels, piping, spheres and fabricated spools, local Post weld heat treatment of carbon steel piping welds (pipe-work, headers, flange joints, valves, and branches) by means of the electrical resistance method, in the form of ceramic heater pads
All PWHT types of equipment are well maintained & have a valid current calibration certificate. Electric power sources are 380/440V 3 phase 50Hz primary supply step down transformer secondary output (heat treatment unit) giving low voltage circuits. Temperature control equipment is either manually operated through energy regulators or automatically operated using modular controls. Recording of temperature, for the electrical resistance method, or the induction heating method is by means of a calibrated chart type temperature recorder.