Q235B通信钢管塔断裂失效VIP免费

Q235B 通信钢管塔断裂失效分析与解决方法范文静 孙维连﹡ 王会强 孙铂 （河北农业大学机电工程学院, 保定, 071001）摘要：Q235B 碳素结构钢制造通信塔在矫直过程中出现焊接处断裂。采用扫描电镜、光学显微镜、以及力学性能测试等方法，对断裂构件进行了分析，并对化学成分和力学性能进行检测。结果表明，材料原始组织铁素体和珠光体呈带状分布，导致材料出现各向异性。在矫直过程中，应力在焊接处造成集中，超过了材料的抗弯极限，导致其发生脆性开裂。经试验，构件焊接后，采用退火工艺可消除此类故障。关键词：Q235B；通信钢管塔；脆性开裂；失效分析Failure Analysis and resolved Methods of Q235B Communication Tower of steel tubeFan WenJing,Sun WeiLian,Wang HuiQiang,Sun BoElectrical and Mechanical Engineering College Agricultural University of Hebei, P.R.China, 071001Abstract: Q235B constructional carbon steel Communication Tower of steel tube is cracked in weld during straightening.Using of Scanning Electron Microscopy (SEM)，Metallographical examination, and Mechanical properties measurement, the cracking was analyzed. Besides,the chemical composition and mechanical properties were testing.The results show that in the primordial structure there are banded ferrite and pearlite , which brought about anisotropy . In the straighten process, The banded structure caused the stress concentration in weld. The resultant stress exceeded the ultimate bending strength of the material,and then caused the brittle cracking.When the component has been jointed, Via the examination,introduce the anneal technics could avoid this failure.Keywords:Q235B;Communication Tower of steel tube;Brittle cracking;failure analysis通信塔由数根圆筒形构件连结而成，圆筒周身布有翅片，与杆身焊接一体，以供通信天线安装。外形如图 1 所示。塔材料为 Q235B 焊接钢管。翅片和法兰焊在钢管上，部分钢管由于焊接应力产生弯曲，需通过矫直才能使用。具体方法是：并排两根钢管，其两端用钢丝绳固定，中心处用千斤顶外推，出现钢...