机械工程材料
MATERALS FOR MECHANCAL ENGIMEERIWG DO1: 10.11973/jxgcel201611021
2016年11月第40卷第11 期Vol, 40 Ne, 11 Nov,2016
DH32船板钢埋弧焊接头白
的力学性能
梁国俐
（唐山学院机电工程系，唐山063000）
摘要：采用埋弧焊对DH32高强度船板钢进行了焊接，通过扫描电镜、拉伸和冲击试验机等测试了焊接接头的力学性能并分析了其冲击断口形貌。结果表明：该钢10道次理弧焊焊接接头的拉伸断裂位置均在靠近热影响区的母材区，接头的抗拉强度与母材的相当，没有出现明显的软化现象；焊缝、熔合区、热影响区试样的平均冲击功分别为55，58，75J，均满足冲击功不小于34J的要求；随着距焊缝中心距高的增大，焊接接头冲击断口中的纤维区面积增大，接头基本不存在韧性最差区，
关键词：DH32船板钢；理弧烊；抗拉强度；冲击韧性
中图分类号：TG115.28
文献标志码：A
文章编号：1000-3738(2016)11-0103-03
Mechanical Properties of Submerged Arc Welded Joint of
DH32ShippingPlateSteel
LIANG Guo-li
(Department of Electro-Mechanical Engineering, Tangshan College, Tangshan 063000, China)
Abstract : The high-strength DH32 shipping plate steel was welded by submerged arc welding. Then the mechanical properties of the welded joints were measured and the impact fracture morphology was analyzed by using scanning electron microscope, tensile tester, impact tester, and so on. The results show that after the 1o pass submerged arc welding , the welded joints all fractured near the base material close to the heat affected zone during tensile test. The tensile strength of the joint was almost as high as that of the base material and the softening phenomenon was not observed. The average impact energies of the specimens in weld, fusion zone and heat affected zone were 55, 58 , 75 J respectively, which all met the requirement of impact energy over 34 J. With the increase of the distance from the weld center, the fibrous area at the impact fracture surface of the welded joint increased and basically there was no zone with the worst toughness in the welded joint.
Key words: DH32 shipping plate steel; submerged are welding: tensile strength; impact toughness
0引言
我国对船板钢的市场需求量增长迅速，且质量
等级要求也越来越高。一般强度级别的A、B级船板钢已不能满足用户的需要，开发DH、EH、FH系列高强度船板钢迫在眉睫[1-3]。这些新系列船板钢具有低碳、低合金、高强度、高韧性、强耐蚀性、较高的冲击韧性和较低的时效敏感性等特点，作为一般强度船板钢的替代产品，在发达国家已得到了广泛
收稿日期：2015-12-04：修订日期：2016-08-26
基金项目：唐山市科技计划项目(14130237B)；河北省钢铁联合研究
基金资助项目（E2015105052）
作者简介：案国例(1974一），女，河北唐山人，副教授，博士
研究和应用-。随着强度级别的提高，碳及一些合金元素的加人使高强度船板钢焊接后其接头热影响区易脆化并形成裂纹。同时，焊接接头热影响区的软化、高强度船板钢的焊接成形等问题也成为其是否能得到有效应用的关键5-汀，目前，高强度船板钢的焊接主要采用埋弧自动焊、CO，气体保护半自动焊、垂直气电立焊、氧弧焊和激光焊等焊接工艺，而埋弧焊由于其焊缝质量高、生产效率高和劳动条件好，在船板钢尤其是中厚船板钢焊接中的应用比例越来越高。
为解决DH32高强度船板钢的焊接问题，作者对该船板钢进行了多道次埋弧焊，研究了焊接接头的力学性能，并分析了冲击断口形貌，
103