【Daily Question】2015.12.15 Preheating before welding (2 wealth points for a reply; +3–8 additional wealth points if the answer is correct)

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This post was last edited by FORREST_GUMP on 2015-12-16 at 19:05. The Mechanical Forum has introduced the \"Question of the 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. Multiple-choice question: Preheating before welding can (A) A. Reduce welding stress B. Increase welding stress C. Reduce welding deformation D. Reduce welding deformation and also reduce welding stress. Note: We will close this thread after 24 hours, and at that time we will announce the best response (the best answer), along with the answers and explanations. Charisma Reward: Those who post a topic in this section within two days to provide a detailed explanation or discussion on the knowledge points related to this question are asked to reply/comment in this post to inform us, and we will grant 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. The competition for \"Active Experts and Weekly Stars\" in the Machinery section has started: http://bbs.hcbbs.com/thread-1489069-1-1.html. The 2015 Hailuan Top 10 selection – please recommend candidates; there are prizes available: http://bbs.hcbbs.com/thread-1505454-1-1.html