PWHT & Preheating Services for Welding Integrity and Stress Relief
Fairtex delivers Post Weld Heat Treatment (PWHT) and controlled preheating services for piping systems, pressure vessels, storage tanks, structural steel, and fabrication assemblies across offshore and industrial environments. The service is designed to improve weld microstructure, reduce residual stresses, and support compliance with applicable welding and fabrication codes.
Our heat treatment capabilities include localized electric resistance heating, induction heating, gas-fired systems, and temporary or permanent furnace heat treatment solutions. Services are executed by experienced heat treatment specialists using calibrated monitoring systems and controlled heating cycles to ensure process consistency and metallurgical integrity.
Typical applications: process piping welds, pressure vessels, refinery systems, offshore platforms, storage tanks, structural fabrication, bullet tanks, bridge structures, petrochemical facilities
What this service covers
Localized PWHT for Piping & Vessel Welds
Fairtex performs localized PWHT on butt welds, closing seams, and structural welds using electric resistance heating pads and induction coil systems. Controlled heating and cooling cycles help minimize residual stress and improve weld performance in pressure-containing systems.
Preheating for Welding Operations
Preheating services are provided prior to welding to reduce thermal shock, prevent hydrogen cracking, and improve weld quality. Heating methods are selected based on material type, wall thickness, and welding procedure requirements.
Furnace Heat Treatment & Normalizing
Temporary and permanent furnace heat treatment services are available for normalizing, annealing, tempering, and stress relieving applications. Systems can be configured using gas firing, oil firing, induction heating, or electric resistance methods depending on project requirements.
Tank & Large Vessel Heat Treatment
Fairtex performs internal high-velocity gas firing for spherical tanks, bullet tanks, and large storage vessels where localized heating is not practical. This supports uniform thermal treatment for large fabricated structures and pressure-retaining systems.
Code Compliance & Temperature Monitoring
All PWHT activities are executed in accordance with applicable welding codes and client specifications. Temperature control and recording systems are used throughout the heating cycle to maintain compliance and provide traceable documentation.
Key Takeaways
- Localized and furnace-based PWHT solutions for industrial fabrication
- Electric resistance, induction, gas-fired, and oil-fired heating methods
- Supports weld integrity, stress relief, and metallurgical stability
- Applicable to piping, vessels, tanks, and offshore structures