Electrical PWHT

Electrical Post Weld Heat Treatment (PWHT) delivers precise, uniform heating to relieve residual stresses, improve mechanical strength, and ensure metallurgical stability of welded components.

Typical Applications

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PWHT by Electrical Resistance Method

Post Weld Heat Treatment (PWHT) is performed to relieve residual stresses, reduce hardness, and enhance the mechanical properties of welds. The Electrical Resistance Heating Method is one of the most widely used on-site PWHT techniques due to its accuracy, portability, and suitability for large structures.

Codes and Standards Followed

PWHT using electrical resistance heating complies with:

ASME Section VIII Div. 1 & 2
ASME B31.1 / B31.3
API 650 / 653
NACE MR0175
Customer-specific specifications

Advantages of Electrical Resistance PWHT

Highly accurate temperature control
Portable for site applications (pipelines, boilers, pressure vessels)
Suitable for:
- Large structures
- Restricted spaces
- Pre-heating + PWHT combination
Ensures uniform heat distribution
Easy documentation with automatic data recorders

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Components Used (Electrical PWHT)

Electrical PWHT uses high-quality, field-proven components designed to deliver precise, uniform, and controlled heat treatment.

Components Used

Nichrome wire embedded in ceramic beads, flexible and suitable for pipes, vessels, and complex shapes.

Temperature Controllers / Power Consoles

Multi-zone controllers (commonly 6–12 zones) manage ramp rate, soak temperature, and cooling

Thermocouples (K-Type / J-Type

Welded on the job to measure accurate metal temperature

Insulation Blankets

Ceramic wool or rock wool to retain heat and ensure uniformity.

Cables, Splitters & Accessories

Connect heaters to power sources safely