Post Weld Heat Treatment

PWHT is a crucial post-welding process that enhances the structural integrity of metal components by relieving residual stresses, improving toughness, and preventing future cracking.

Overview

Post Weld Heat Treatment (PWHT) is an essential process carried out after welding to reduce residual stresses and improve the mechanical properties of welded components. PWHT involves heating the welded material to a predetermined temperature, holding it for a specific period, and then cooling it under controlled conditions.
This treatment is critical for materials susceptible to cracking, such as carbon and alloy steels, and is often mandated by codes like ASME, API, and AWS to ensure safety and long-term performance. PWHT is widely used in pressure vessels, pipelines, boilers, and structural steel fabrication.

Benefits of Services

PWHT minimizes the risk of cracking, enhances ductility, and ensures welded components meet design specifications and industry standards. It also stabilizes material structure and prolongs service life.

Inspection Type

Stress Relief Heat Treatment

Normalizing / Tempering of Welded Joints

Testing Scope

Pressure vessels, pipelines, boilers, structural components, and process piping in refineries and power plants

Project Duration

4–7 Days (Depending on weld length and material thickness)

Inspection Site

Onsite (India) / In-house Heat Treatment Furnaces

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Reliable Heat Treatment Services with Industry Accuracy

We offer expert Post Weld Heat Treatment solutions to improve the strength and safety of critical welded components—trusted across industries from power to petrochemical.

94%

Accuracy

Precision heating and temperature holding tailored to material specifications and welding codes.

93%

Repeat Client Rate

Our clients prefer our on-site PWHT for reducing downtime and ensuring code compliance.

96%

Time Efficiency

Fast mobilization, setup, and execution minimize project delays.

96%

Project Success Rate

PWHT contributes significantly to safe operations and extended service life.

F. A. Q

Common Questions

Common Questions about PWHT Services.

PWHT is a thermal treatment process applied to welded materials to relieve stresses and improve mechanical properties after welding.

PWHT helps avoid cracking, hydrogen embrittlement, and failure in pressure vessels, pipelines, and structural components.

Materials like carbon steel, alloy steel, and chromium-molybdenum steel often require PWHT depending on thickness and service condition.

No. PWHT is generally required based on material type, thickness, design code, and service application.

Skipping PWHT can result in reduced toughness, cracking, distortion, and non-compliance with codes, risking failure during service.

Temperature is precisely controlled using programmable heat treatment machines with multiple thermocouples placed on the component. This ensures uniform heating, accurate holding, and gradual cooling, as required by industry standards.

 
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