Relation of HAZ Hardness, Heat Input, and Post-Weld Heat Treatment (PWHT) R

𝐑𝐞𝐥𝐚𝐭𝐢𝐨𝐧 𝐨𝐟 𝐇𝐀𝐙 𝐮𝐭, 𝐚𝐧𝐝 𝐏𝐨𝐬𝐭-𝐖𝐞𝐥𝐝 𝐇𝐞𝐚 𝐭 𝐓𝐫𝐞𝐚𝐭𝐦𝐞𝐧𝐭 (𝐏𝐖H𝐓):

𝐇𝐚𝐫𝐝𝐧𝐞𝐬𝐬 is a measure of a material's resistance to deformation, denting, and scratching.

𝗛𝗔𝗭 (𝗛𝗲𝗮𝘁-𝗔𝗳𝗳𝗲𝗰𝘁𝗲𝗱 𝗭𝗼𝗻𝗲) represents the area adjacent to the weld that is affected by thermal cycling.

Quality is influenced by factors such as heat input, welding parameters, and base metal composition.

✧ Increasing heat input can lead to a larger HAZ, slower cooling rate, and rougher microstructure, which can lead to lower strength (higher hardness).

✧ Lower heat input can result in smaller HAZ, faster cooling rate, and higher strength (lower hardness). 𝗣𝗼𝘀𝘁-𝗪𝗲𝗹𝗱 𝗛𝗲𝗮𝘁 𝗧𝗿𝗲𝗮𝘁𝗺𝗲𝗻𝘁 (𝗣𝗪𝗛𝗧) by appropriately relaxing the stress and changing the microstructure. Reduces HAZ hardness.

Note: This section features several affiliate links, meaning we will earn a small commission if you purchase through these links...