POST WELD HEAT TREATMENT SERVICES (PWHT) PT. MITRA ARTHA CEMERLANG ( PWHT ) Terlengkap

PT. MITRA ARTHA CEMERLANG was established in 2009 to provided services excellence in Indonesia to Oil and Gas, Petrochemical, Power Generation, Marine Fabrication and Metallurgy Industries Company. Since the company was established its commitment to onshore and offshore services has been a dominant feature in development of well earned reputation on the highest standards of quality and technical expertise. The directors aim are to provided the best possible range of quality services by ensuring that employees are properly trained and that they are provided with modern equipment and the latest instrument. PT. MITRA ARTHA CEMERLANG has its disposal an ever increasing number of applied resistance heat using a combination of low voltage transformer, power source and main voltage distribution control unit. The latter being normally used on large pressure vessel On site pre-heating, hydrogen de-gassification and post weld heat treatment of pipe work, welded fabrication and pressure vessels. Flexible electrical resistance heating elements are manufactured in a range of sizes to suit wide range of application and are connected to either low voltage (65 Volt) or high voltage (240 Volt) power source. Temperatur control is via pre programmable microprocessor based and temperatur measurement by pre calibrated temperatur recorders. All temperatur recorder measuring equipment is calibrated in accordance with national standards. • PRE HEATING Is the application of heat to the base metal prior to welding or cutting operations. It does not change the properties of the steel, but it is advisable under certain conditions to drive off moisture and helps to ensure even expansion to eliminate undesirable stresses. Concurrent heating during welding (also referred to as preheating) retards the cooling thus preventing the formulation of an under bead crack • STRESS RELIEVING (POST WELD HEAT TREATMENT) Is the heating of steel to a relatively high temperatur and maintaining that temperature for a specific periode of time. The purpose is to reduce internal stresses, caused by welding, quench hardening or by cold working. It also has an advantageous effect on the elasticity, ductility and strength of the metal. This process involves heating the steel to a temperature below the materials’ transformation point. • ANNELING Is essentially the softening of a metal to make it more malleable. The process involves a controlled heating and slow cooling which induces softness and ductility . Additionally, the process removes gases, relieves stresses and enhances the mechanical properties in alloyed steels. This is generally performed at temperatures above the materials’ re-crystallisation point. • NORMALIZING Is much like annealing, but the cooling process is much faster. This results in increased strength but less ductility in the metal. It also produces a higher yield strength with greater tensile strength, and in most instances, a higher impact resistance. This process involves heating the steel to just above the upper critical limit. • SOLUTION HEAT TREATMENT Is performed on certain types of austenitic stainless steel to prevent decay in weldment. This is done at a very high temperatures (e.g) 1200C and the cooling is very rapid