Post Weld Heat Treatment (PWHT): Enhancing Weld Strength and Structural Reliability
Introduction
In high-pressure and high-temperature industries, welding is not just a process—it’s a structural foundation. However, welding also introduces residual stresses and metallurgical changes that can affect long-term performance. That’s where Post Weld Heat Treatment (PWHT) comes in.
At Inspection Technic, we provide precise and code-compliant PWHT services designed to relieve stress, restore toughness, and ensure the integrity of your critical components.
🧪 What is Post Weld Heat Treatment (PWHT)?
PWHT is a controlled heating and cooling process performed after welding to reduce residual stresses, improve ductility, and modify the microstructure of the welded area. It is commonly used on carbon steel, alloy steel, and pressure-containing parts in sectors like oil & gas, power plants, refineries, and fabrication yards.
🎯 Objectives of PWHT
✅ Stress Relief: Reduces internal stresses caused by welding, preventing cracking or deformation.
✅ Hardness Reduction: Softens the heat-affected zone (HAZ), making the material more ductile and less brittle.
✅ Improved Microstructure: Restores grain structure altered during welding.
✅ Hydrogen Removal: Minimizes risk of hydrogen-induced cracking in pressure equipment.
✅ Code Compliance: Meets regulatory standards like ASME, API, IBR, and NACE.
🏗️ Industries We Serve
Our PWHT services are widely used in:
Oil & Gas Refineries
Petrochemical Plants
Pressure Vessel and Boiler Manufacturing
Pipeline and Piping Fabrication
Power Plants and Thermal Stations
Structural Steel & Equipment Manufacturing
🛠️ Our PWHT Capabilities
Inspection Technic provides both in-shop and on-site PWHT solutions using industry-standard electronic resistance equipment.
Our capabilities include:
🔧 Electrical Resistance Heating up to 800°C+
🧯 Controlled Ramp-Up & Cool-Down Cycles
📈 Real-Time Temperature Monitoring and Graphing
📄 PWHT Charting & Documentation (digitally recorded)
📍 Portable Equipment for Site Work
✅ Compliance with ASME Sec VIII, B31.1, B31.3, IBR, and more
Whether it’s localized PWHT of weld joints or full component stress relief, our qualified team ensures accurate heat soak cycles and metallurgical consistency.
🧭 Ready to Inspect Your Infrastructure with Confidence
Whether it’s a pipeline network in Gujarat or a pressure line in Dar es Salaam, INSPECTION TECHNIC helps operators deliver resources safely, efficiently, and sustainably.
Let’s build durable infrastructure with inspection that lasts.