Haba Stress Engineering has been providing on site Post Weld Heat Treatment (PWHT) services to various customers in the Asia countries and entire world since its inception. Projects which are carried in and out of Malaysia managed to exposes ours to the demands and requirement are met
professionally and with stringent care.
Haba Stress Engineering will not be of existence if due to a group of qualified, highly skilled and experienced technician who are from our mainland. At present, our company has more than sixty (60) technicians who are capable to work on your project. Following on that, our teams have strong
motivation and dedication with experienced supervisors and managers leading to fulfill the project related on PWHT with supportiveness and accordance to
International Standard.
To provide the utmost in quality, with the best service,
at a competitive price."
+ Preheating During Welding provides the following benefits:
+ Reduces the levels of thermal stress.
+ Provides compensation for high heat losses.
+ Minimizes the rate of weld hardening.
+ Reduced porosity in the weld.
+ Reduced hydrogen cracking.
+ Improved microstructure of heat affected zone.
1. Softening: Softening is done to reduce strength or hardness, remove residual stresses, improve toughnesss, restore ductility, refine grain size or change the electromagnetic properties of the steel.
2. Restoring ductility or removing residual stresses is a necessary operation when a large amount of cold working is to be performed, such as in a cold-rolling operation or wiredrawing. Annealing full Process, spheroidizing, normalizing and tempering— austempering, martempering are the principal ways by which steel is softened.
3. Hardening: Hardening of steels is done to increase the strength and wear properties. One of the pre-requisites for hardening is sufficient carbon and alloy content. If there is sufficient Carbon content then the steel can be directly hardened. Otherwise the surface of the part has to be Carbon enriched using some diffusion treatment hardening techniques.
4. Material Modification: Heat treatment is used to modify properties of materials in addition to hardening and softening. These processes modify the behavior of the steels in a beneficial manner to maximize service life, e.g., stress relieving, or strength properties, e.g., cryogenic treatment, or some other desirable properties, e.g., spring aging.Parts which have been heavily formed, machined, cut or are fabricated by welding, have high internal stresses. The part or assembly can be made stress free by heating to a certain temperature, where the stresses will be removed by thermal relaxation, without affecting the mechanical properties of the part. The resultant part will be far less prone to warp change dimensions, during further processing or use.
Thermal stress relieving can be performed on various materials, including plastics, aluminiums, steels andalloys.
