【Daily Question】October 21, 2015 – Non-destructive testing (2 wealth points for replying; +3 to +8 wealth points if the answer is correct)

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This post was last edited by zzhaichuan on 2015-10-22 09:04. The Machinery Section has introduced the \"One Question per Day\" feature, which not only helps to foster an active atmosphere for technical discussions and guide the direction of such exchanges but also provides users with financial rewards, enabling them to experience various cool features. Title: Defects that are not allowed to be present inside a welded joint are ( ____cde_____ ). a. Porosity ； b. Slag inclusions c. Cracks d. Undercutting e. Lack of fusion. According to 47013.2, cracks, lack of penetration, and unmerged areas are rated as Grade IV, whereas standard 150.4 specifies that the minimum acceptable grade for welds is Grade III. Please note: We will close this thread after 24 hours, and at that time we will announce the best reply (the best assistance), as well as the answer and explanation. Charisma Reward: Those who post a topic in this section within two days to provide a detailed explanation or discussion of the knowledge points related to this question are asked to reply/comments in this post to inform us, and we will then award them charisma points. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights and opinions. After registration, we will rank based on the content of the posts: the last-place contestant will receive +1 charm, the second-to-last +2 charm, and so on, with the highest score earning +5 charm. http://bbs.hcbbs.com/thread-1381938-1-1.html Earning wealth by inviting friends http://bbs.hcbbs.com/thread-1389240-1-1.html [Mechanical Section] Collection of essential knowledge 【Seeking manufacturer sponsorship】 (long-term campaign)