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Our Services

SCOPE OF SERVICE

As stated before, Global PWHT Sdn. Bhd. performs a Post Weld Heat Treatment processes as its operation and with teams of skilled technicians, trained technicians/operators and genuine, high quality parts, updated technology, Global PWHT Sdn Bhd provides support you expect and deserve. Global PWHT Sdn Bhd assure its clients reliable Heat Treatment by means of the latest up-to-date techniques and modern equipment. Its clients avoid the expenses of training and employment of special skilled personnel, who may not be fully utilized, and the purchase and maintenance of expensive testing facilities, which may be rapidly outdated. Global PWHT Sdn Bhd performs Heat Treatment in manufacturer workshop and fields construction sites where structural building, factories, power plant, refineries and industrial plants are being built, operated and maintained. Teams of skilled technicians fully trained and holding qualifications to local and/or international standards are sent to the test site with all the necessary equipment and materials. In particular, our technicians are fully familiar with the following code and standard pertaining to our Heat Treatment requirements: MS, BS, EN, AWS, ASTM, API, ASME and Swedish Standard. If a particular Heat Treatment method is not specified, Global PWHT Sdn Bhd technical personnel are available to give impartial advice concerning the technical and economic considerations and the method that will be of the greatest advantage to client.

Post Weld Heat Treatment (PWHT)

Post weld heat treatment is the most widely used form of stress relieving on completion of fabrication of welded structures. The principle is that as the temperature is raised, the yield stress and the elastic modulus of the material fall. Post Weld heat treatments done after welding/machining to improve the chemical mechanical properties of weldment / machined surfaces. In concept, PWHT covers many different potential treatments. A point is reached when the yield stress no longer supports the residual stresses and some localised plastic deformation occurs. Post weld heat treatment in the context described here refers to the process of reheating a weld to below the lower transformation temperature at a controlled rate, holding for a specific time and cooling at a controlled rate.

Normalising / Annealing and High Temp Heat Treatment.

Normalising Annealing and Solution heat treatments to a maximum temperature of 1100 deg C are performed using specially fabricated Kanthal D Type Heating elements in association with with low thermal mass insulation. The heating can be performed by localised Heating methods or by the use of the heaters within temporary or permanent furnace installations. Furnaces of any size can quickly be erected and fired to suite your application at site using the modular panel technique.

Hardness Testing (HT)

Non-uniform heating or cooling of the tube can result in serious anomalies in the hardness throughout the body of the pipe. In the case of a hard spot,the hardness level is considerably higher than that of the surrounding metal,usually as result of localized quenching. High hardness is often associated with loss of ductility,which can lead to brittle fracture. The problem is more common with large diameter line pipe than with casting or tubing.


 
Ultrasonic Testing

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Penetrant Testing

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Welding Inspector

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NDT Inspector

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Painting Inspector

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QA/QC Inspector

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Global PWHT Sdn. Bhd. NO:3, Kawasan Industri, Taman Pinggiran Senawang, 71450 Seremban, Negeri Sembilan.
Tel : 06 679 7900 Fax : 06 679 8900, Email: niyaz@pwht.my
Copyright © 2014 Global PWHT Sdn. Bhd. Malaysia - All rights reserved.
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