Question: For Class A boilers, carbon steel butt welds – is impact testing required for welds with a single-sided wall thickness greater than 16?
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As the title suggests, this relates to clause 4.3.2.2 (2) of TSG 11-2020 – alloy steels are required to have an impact energy value; what about carbon steels such as 20G? I ask all the experts to pay attention to this, thank you.
According to the \"Regulations on Safety Technical Inspection of Special Equipment – Regulations on Safety Technical Inspection of Boilers\" (TSG 21-2020) you mentioned, for butt welds of carbon steel (such as 20G), if the wall thickness is greater than 16 mm, an impact test is generally required as well. Although the specifications for alloy steel clearly set out requirements regarding impact energy, although the carbon steel section mentions this requirement less frequently than that for alloy steel, it is essential to conduct impact tests on critical structural components or equipment operating in low-temperature environments, in order to ensure the toughness and safety of the welded areas. Whether an impact test is actually necessary depends on the operating environment and design requirements of the welded structure. It is recommended to consult the latest version of the safety inspection regulations or seek advice from professional welding technicians. At the same time, it is possible to further contact the quality inspection department to ensure compliance with all relevant safety regulations and standards. .
It is necessary to do this; if your boiler drum is 20G and the thickness of the weld joint where it meets the pipes is greater than 16 mm, then this action must be taken