Welding Preheat Treating Systems: Proven Heat Control for Critical Weld Integrity
For more than 65 years, industries have relied on Duraline welding preheat treating systems to deliver consistent, controlled heat for critical welding applications. This proven technology has played a key role in industrial and construction welding across refineries, petrochemical plants, pipelines, structural steel projects, shipbuilding, pressure vessel repair, and mining operations. When weld quality directly impacts safety, performance, and service life, proper preheat and post-weld heat treatment are not optional. Duraline’s electrical resistance preheat systems are designed to meet those demands with reliability and precision.
Why Welding Preheat Matters
Many welding applications require preheating to reduce the temperature difference between the welding arc and the base material. By warming the metal before welding begins, preheat slows the weld cooling rate and lowers hydrogen levels in the weld zone. Together, these effects significantly reduce the risk of cracking and other weld defects that can lead to premature failure. For certain base materials and service conditions, preheating and post-weld heat treatment are required by code or specification. These thermal treatments help ensure proper weld integrity and prevent undesirable metallurgical characteristics in the finished weld.
Benefits of Duraline Welding Preheat Treating Systems
Duraline welding preheat systems offer a practical, field-proven solution for both preheat and post-heat stress relief:
- Preheat, post-heat, and stress relief capability
- Dependable, closely controlled heating using the electrical resistance method
- Complete safety for personnel and equipment
- Ease and speed of installation
- Adaptability to jobs of any size or configuration
- Ability to heat sections from 1/2 inch up to 7 inches thick
- Long service life with complete reusability
- Total application engineering support
These systems are designed for repeated use in demanding environments, making them a cost-effective solution for long-term welding operations.
Welding Mini Preheat Treating Systems
Duraline also offers compact welding mini preheat treating systems for applications that require flexibility without sacrificing performance. These systems are well-suited for job sites where space is limited but precise heat control is still essential.
A typical configuration includes:
- 100 amp, 3-phase, 3-pole, 4-wire input
- Four Duraline 4RJ20 3-pole, 4-wire output receptacles
- Support for up to 80 heaters in certain configurations
- Heater voltage rated at 480 volts
- Integrated percentage timer to control heating time
The percentage timer allows users to easily calibrate heat output to match specific welding procedures, material thicknesses, and job requirements.
Designed for Demanding Welding Environments
Duraline welding preheat treating systems are built for real-world conditions. Their rugged construction, reliable electrical resistance heating, and adaptable design make them suitable for everything from pipeline field welding to shipyard fabrication and industrial maintenance. By providing controlled, even heat before and after welding, these systems help reduce rework, minimize downtime, and extend the service life of critical welded components.
A Trusted Solution for Over Six Decades
With more than six decades of proven performance, Duraline welding preheat treating systems continue to be a trusted choice for contractors, fabricators, and maintenance teams who need reliable heat treatment equipment. Whether used for preheat, post-weld heat treatment, or stress relief, these systems deliver the control, safety, and durability required to protect weld quality in the most demanding applications.