On-Site Heat Treatment for Power Generation Projects

Keep power generation projects moving with on-site heat treatment services from Axiom HT. Access preheat, PWHT, and specialized heating methods backed by experienced leadership and careful project planning for complex industrial work.

Power Plant Heat Treatment Services

Power plant components face demanding temperatures, pressures, and operating conditions. Proper heat treatment helps maintain weld integrity, manage residual stress, and achieve required material properties.

Axiom HT delivers on-site heat treatment for power generation projects, from preheat and PWHT to specialized heating applications.

Heat Treatment for Power Generation Equipment

Axiom HT provides resistance and induction heat treatment for several power generation applications, including:

07Chemical Processing

08Pipeline & Infrastructure

09Pressure Vessel Manufacturing

Additional services include modular heat treatment management, bolt and tube removal, and rotor expansion.

Heat Treatment Services and Their Applications

Different stages of fabrication, welding, and maintenance call for different heat treatment processes. Axiom HT offers the following services:

      
        ServicePurpose

        PreheatHeats metal to the required temperature before and during welding.
Post-Weld Heat Treatment (PWHT)Relaxes residual stresses caused by welding and other processes.
Hydrogen Bake-OutDrives out hydrogen that may have been introduced during welding.
Post HeatingMaintains preheat after welding to allow hydrogen to diffuse from the weld.
Line ThawApplies heat to liquefy congealed or solidified product within a process system.

      

Service	Purpose
Preheat	Heats metal to the required temperature before and during welding.
Post-Weld Heat Treatment (PWHT)	Relaxes residual stresses caused by welding and other processes.
Hydrogen Bake-Out	Drives out hydrogen that may have been introduced during welding.
Post Heating	Maintains preheat after welding to allow hydrogen to diffuse from the weld.
Line Thaw	Applies heat to liquefy congealed or solidified product within a process system.

Heating Methods for Power Plant Applications

The right heating method depends on the component, application, and project requirements. Axiom HT offers three primary heating methods.

Electrical Resistance Heating

Uses flexible, low-voltage ceramic heating elements for controlled heating. Applications include preheat, PWHT, hydrogen bake-out, post-heating, and thermal stabilization.

Induction Heating

Uses electromagnetic fields to generate heat directly within metal components. It supports applications including preheat, PWHT, hydrogen bake-out, line thaw, bolt heating, and turbine rotor expansion.

Combustion Heating

Uses high-velocity burners to deliver heat to large structures and equipment. Applications include refractory dry-outs, furnace heat-ups, and pressure vessel heat treatment.

Preheat Temperature Requirements

The right preheat temperature depends on the material being welded, its thickness, and applicable industry codes. Axiom HT highlights three key considerations when determining preheat requirements:

Industry Codes and Standards

Industry codes define preheat temperature requirements to control cooling rates and prevent weld defects.

Material Specifications

Heating layouts, thermocouple placement, temperature control strategy, and safety procedures are planned to support efficient field execution.

Controlled Heating Execution

Heat treatment is performed using the appropriate heating method, with continuous temperature monitoring throughout the process.

Why Choose Axiom HT for Power Plant Heat Treatment?

135+ Years of Combined Experience: Axiom HT’s executive leadership team and subject matter experts bring more than 135 years of combined experience.
On-Site Expertise: Full-service field heat treatment for industrial applications.
Multiple Heating Methods: Electrical resistance, induction, and combustion heating to accommodate different applications.
Blended Heating and Cooling: Axi-Therm combines heating methods with cooling to help manage project costs and schedules.
Project Planning: Support with heat treatment planning, budgeting, scheduling, and execution.

Benefits of Heat Treatment

Properly controlled heat treatment supports weld quality, metallurgical stability, and compliance with project requirements.

Reduces Weld Cracking Risks

Preheat helps control cooling rates and minimize the risk of hydrogen-induced cracking during welding.

Improves Mechanical Properties

Proper preheat promotes a more ductile and uniform microstructure in the weld and heat-affected zone.

Relieves Residual Stress

Post-weld heat treatment helps relax residual stresses introduced during welding.

Supports Code Compliance

Maintaining required temperatures in accordance with applicable codes and approved welding procedures.

Need Heat Treatment Support for Your Power Plant?

Get experienced on-site heat treatment support for your power generation project. Contact Axiom HT to discuss your equipment, technical requirements, scheduling, and project needs with our team.

Frquently Asked Questions

What heat treatment services does Axiom HT provide for power plants?

Axiom HT provides preheat, post-weld heat treatment, hydrogen bake-out, post-heating, and other heat treatment applications. Its power generation services also include heat treatment of piping, headers, main steam lines, and turbine casings.

Why is preheat important before welding?

Preheat slows the cooling rate of the weld area, reduces hydrogen-induced cracking risks, and supports proper weld fusion and metallurgical stability.

What is the difference between preheat and PWHT?

Preheat is applied before and during welding to maintain the required metal temperature. PWHT is performed after welding to relax residual stresses.

Which heating methods does Axiom HT offer?

Axiom HT offers electrical resistance, induction, and combustion heating. These methods can also be combined through its Axi-Therm blended heating and cooling solution.

Does Axiom HT provide on-site heat treatment?

Yes, Axiom HT provides on-site heat treatment services for energy, chemical, refinery, and industrial projects across the United States.