Length: 2 days
It is essential to understand how materials respond to the rapid thermal cycle that occurs during most welding operations as well as the resulting properties in the weldments. These properties are directly related to the material composition and microstructure, the welding process, the weld filler metal, and even the welding techniques used. To be successful, the ferritic (iron-based) materials commonly used in the pressure containing applications of the ASME Codes may require significant differences in the preheating and Post Weld Heat Treatment (PWHT) requirements.
This course provides the information necessary to understand and implement these requirements. It covers the rules for weld preheating, post weld heat treatment, post bending heat treatments (PBHT), and the use of material heat treatments.
The course begins with the basics of welding metallurgy and the reaction to heat treatments. It then provides the background information needed to make decisions concerning the technical needs and the Code requirements for heat treatment. The course also discusses the ASME Code rules addressing preheating, PWHT, and PBHT to highlight the differences between ASME Code requirements and the current efforts to ensure consistency. The covered Codes include:
ASME Section I, Power Boilers
ASME Section III, Nuclear Power Plant Components
ASME Section VIII, Pressure Vessels
ASME Section IX, Welding, Brazing, and Fusing Qualifications
ASME B31.1, Power Piping
ASME B31.3, Process Piping
The control of the preheating and PWHT is particularly important to the newer materials that are required for high temperature applications. The concerns and the prevention of problems for the control of preheating and of furnace and local PWHT will also be discussed.
In-class exercises and a short workshop will be used to reinforce the heat treatment, preheat and PWHT requirements.
You Will Learn To
- Explain the metallurgical effects of heat treatment, including PWHT, PBHT, and materials heat treatments
- Describe the effects of welding fabrication preheating and PWHT on the properties of the completed product
- Explain ASME Code requirements for preheating and PWHT
- Explain the requirements for PBHT in the Codes
Describe the controls needed for effective heat treatments
Who Should Attend
Pressure equipment (boilers, pressure vessels, and piping) engineers and designers, fabricators and erectors, welding foremen, welding engineers, corrosion engineers, QA/QC personnel, maintenance supervisors and engineers, and regulatory and insurance staff.
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