孙艳芬,朱天一,田松亚.埋弧焊热输入对Q355B厚板焊接接头组织及性能的影响[J].精密成形工程,2025,17(2):122-129.
SUN Yanfen,ZHU Tianyi,TIAN Songya.Influence of Heat Input of Submerged Arc Welding on Micro-structure and Properties of Q355B Thick Steel Welded Joint[J].Journal of Netshape Forming Engineering,2025,17(2):122-129. |
| 埋弧焊热输入对Q355B厚板焊接接头组织及性能的影响 |
| Influence of Heat Input of Submerged Arc Welding on Micro-structure and Properties of Q355B Thick Steel Welded Joint |
| 投稿时间：2024-03-25 |
| DOI：10.3969/j.issn.1674-6457.2025.02.014 |
| 中文关键词: Q355B厚板 埋弧焊工艺 低中高热输入 焊缝和热影响区组织 焊接接头力学性能 |
| 英文关键词: Q355B thick plate submerged arc welding process low, medium and high heat input micro-structure of weld and heat affected zone mechanical properties of welded joint |
| 基金项目:国家自然科学基金(52175223);江苏省产学研合作项目(BY2021589) |
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| 中文摘要: |
| 目的 确定Q355B厚板埋弧焊的最佳热输入参数，分析热输入对其焊接接头组织和性能的影响规律。方法 选取32 mm厚Q355B钢板，选用H10Mn2焊丝和SJ101焊剂，匹配27.43、30.17、34.97、39.00 kJ/cm 4种热输入进行焊接。采用光学显微镜、洛氏显微硬度计、液压万能试验机和摆锤冲击试验机分别对接头组织、硬度、拉伸性能和冲击性能进行测试。结果 当热输入为27.43 kJ/cm时，焊缝和粗晶区组织以铁素体为主，存在少量的珠光体和贝氏体，接头硬度为83HRB~90.5HRB，抗拉强度为524.5 MPa，冲击功为112.7 J和121.3 J;当热输入增加到30.17 kJ/cm时，焊缝组织基本无变化，粗晶区铁素体和珠光体增多，粒状贝氏体减少，接头硬度为82.7HRB~88.7HRB，抗拉强度为518 MPa，冲击功为121 J和132 J;继续增加热输入到34.97 kJ/cm，焊缝和粗晶区块状铁素体增多，粒状贝氏体和珠光体减少，晶粒变粗大且出现魏氏组织，接头硬度为83.5HRB~88.1HRB，抗拉强度为522 MPa，冲击功为106.7 J和118 J;当热输入达到39 kJ/cm时，焊缝以块状铁素体为主，同时存在少量的先共析铁素体和珠光体，与34.97 kJ时相比，粗晶区组织基本无变化，接头硬度为83.1HRB~85.8HRB，抗拉强度为516 MPa，冲击功为92.3 J和91.7 J。结论 随热输入的增加，焊缝和热影响区组织变粗大，热影响区会出现魏氏组织;同时焊接接头的强度和硬度呈下降趋势，冲击性能呈先增大后减小的趋势;当热输入为30.17 kJ/cm时，焊接接头的组织和综合力学性能最好。 |
| 英文摘要: |
| The work aims to find the optimal heat input parameters of submerged arc welding of Q355B thick plates, and analyze the influence of heat input on the micro-structure and performance of welded joints. A 32 mm thick Q355B steel plate was selected, a H10Mn2 welding wire and SJ101 flux were used to match four kinds of low, medium and high heat inputs (27.43, 30.17, 34.97 and 39.00 kJ/cm) for welding. Optical microscope, Rockwell micro-hardness tester, hydraulic universal testing machine and pendulum impact testing machine were used to test micro-structure, hardness, tensile and impact performance of the joint. When heat input was 27.43 kJ/cm, weld and coarse crystal structure were mainly ferrite, with a small amount of pearlite and bainite, joint hardness was 83HRB-90.5HRB, tensile strength was 524.5 MPa, and impact power was 112.7 J and 121.3 J; When heat input was increased to 30.17 kJ/cm, weld structure was basically unchanged, ferrite and pearlite in coarse crystal structure increased, granular bainite decreased, joint hardness was 82.7HRB-88.7HRB, tensile strength was 518 MPa, and impact power was 121 J and 132 J; When heat input was increased to 34.97 kJ/cm, weld and coarse crystal structure were mainly massive ferrite, granular bainite and pearlite decreased, grains became coarse and Weishi structure appeared, joint hardness was 83.5HRB-88.1HRB, tensile strength was 522 MPa, and impact power was 106.7 J and 118 J; When heat input was 39 kJ/cm, weld was mainly massive ferrite, with a small amount of eutectic ferrite and pearlite, coarse crystal structure was basically unchanged with 34.97 kJ, joint hardness was 83.1HRB-85.8HRB, tensile strength was 516 MPa, and impact power was 92.3 J. In conclusion, with the increase of heat input, micro-structure of weld and heat affected zone becomes thicker, and Widmanstatten micro-structure appears in the heat affected zone. At the same time, strength and hardness properties of the welded joint show a downward trend, and impact performance shows a trend of first increasing and then decreasing. When heat input is 30.17 kJ/cm, micro-structure and comprehensive mechanical properties of the welded joint are the best. |
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