BITS.PVT.LTD

HEAT TREATMENT SERVICES:

A.PRE-HEATING (RESISTANCE OR INDUCTION COIL METHOD):

An induction heating system consists of an induction power supply for converting line power to an alternating current and delivering it to a workhead, and a work coil for generating an electromagnetic field within the coil. The work piece is positioned in the coil such that this field induces a current in the work piece, which in turn produces heat.

The water-cooled coil is positioned around or bordering the work piece. It does not contact the work piece, and the heat is only produced by the induced current transmitted through the work piece. The material used to make the work piece can be a metal such as copper, aluminum, steel, or brass. It can also be a semiconductor such as graphite, carbon or silicon carbide.


B. POST WELD HEAT TREATMENT (RESISTANCE OR INDUCTION COIL METHOD):

Post-weld heat treatment (PWHT) is applied to steel assemblies primarily to reduce the likelihood of brittle fracture by reducing the level of tensile welding residual stresses and by tempering hard, potentially brittle, microstructural regions. For large steel assemblies in particular, PWHT can be an expensive operation, and there is thus an economic incentive to avoid PWHT, wherever possible. Whether PWHT is necessary depends on the fracture toughness at the minimum service temperature, the stress levels and the size of any flaws which may be present. According to current fabrication codes, some structures (for example, where thickness is low) are exempt from PWHT. However, the exemptions differ between codes, and it would be desirable to effect some unification of these differing requirements. The present article reviews exemptions from PWHT in several current codes, and considers the similarities and the differences between them, including maximum permitted thickness for as-welded conditions, the associated toughness requirements (in terms of the Charpy test) and what may be done to effect some rationalisation.

VISUAL EXAMINATION

At BITS PVT LTD we can provide an independent visual testing service for a range of application between such as quality control or imperfections between finished and the original specification like, measuring internal alignment of pipe after fit-up/alignment to cut radiographic rejects. Measurements read in standard on one side and metric on the opposite side.


BITS.PVT.LTD

POSITIVE MATERIAL IDENTIFICATION (PMI)::


The instruments based on the principle of ultrasonic measurement. It can measure thickness of material which allows the ultrasonic wave penetrating with constant speed and reflecting from the back side. With used in many areas of industry, ETC-098 has precise measurement petroleum, metallurgy, shipbuilding, aviation, space fight and so on. It can measure on various type of raw material and component parts. Applicable to monitor pipe and pressure vessel.
Performance is the most important features of our ultrasonic thickness gauges whether its coated bare metal, heavily corroded or clean UTG with drone is proven to be reliable simple and robust.