When welding titanium pressure vessels, preheating is generally not performed; during multi-layer welding, the inter-layer temperature should not exceed ( ).
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When welding titanium pressure vessels, preheating is generally not performed; when welding in multiple layers, the inter-layer temperature should not exceed ( ). A. 120℃ B. 150℃ C. 180℃ D. 200℃ Answer: A Explanation: According to NB/T 47015-2011 \"Welding Code for Pressure Vessels\", P-114, 6.5.2, preheating is generally not required. In multi-layer configurations, the temperature between layers should not exceed 120°C. NB/T 47015-2011 \"Welding Code for Pressure Vessels\" – Inter-pass temperature, General provisions, Welding code 3.6.13: During welding, the inter-pass temperature must be kept within the specified range. When preheating of the welded joint is specified, the temperature between passes should be maintained at or above the preheating temperature. Welding Code for Steel Pressure Vessels 4.4.3: The maximum preheating temperature and interpass temperature for carbon steel and low-alloy steel should not exceed 300°C, while the maximum interpass temperature for austenitic stainless steel should not exceed 150°C. Carbon steel and low-alloy steel: ≤300°C; Austenitic stainless steel: ≤150°C. Welding procedures for aluminum pressure vessels 5.5.2: During welding, the temperature between passes should be kept at no more than 150°C. Aluminum ≤150℃ Welding Procedure for Titanium Pressure Vessels 6.5.2 Preheating is generally not performed. In multi-layer configurations, the temperature between layers should not exceed 120°C. Titanium ≤120°C: Welding procedures for nickel-clad pressure vessels, 8.2.5.11 – The temperature between passes must be kept at 150°C or less; Nickel ≤150℃
The answer is A, which is 120°C. According to the provisions of the Code for Welding of Pressure Vessels, preheating is generally not required when welding titanium pressure vessels. In the case of multi-layer welding, the interlayer temperature should not exceed 120°C. .
This post was last edited by Zhongyuanren on 2023-7-7 05:03. Thank you for sharing. How can, in practice, the interlayer temperature be kept below 120°C during multi-layer welding?
After welding, use infrared temperature measurement; carry out slow cooling, and weld only after the temperature drops below 120 degrees
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