Development of EH36 Thick Plate for Large Heat-input Welding and its Welding Properties

QU Zhiguo; WANG Dongming; ZHAO Heming; YANG Haifeng; ZHANG Youjian; WANG Lizhi

doi:10.7512/j.issn.1001-2303.2024.02.06

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Development of EH36 Thick Plate for Large Heat-input Welding and its Welding Properties
Vol. 54, Issue 2, Pages: 37-43(2024)
DOI： 10.7512/j.issn.1001-2303.2024.02.06

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曲之国，王东明，赵和明，等.超大线能量焊接用EH36厚钢板的开发及其焊接试验［J］.电焊机，2024，54（2）：37-43.

QU Zhiguo, WANG Dongming, ZHAO Heming, et al.Development of EH36 Thick Plate for Large Heat-input Welding and its Welding Properties[J].Electric Welding Machine, 2024, 54(2): 37-43.
曲之国，王东明，赵和明，等.超大线能量焊接用EH36厚钢板的开发及其焊接试验［J］.电焊机，2024，54（2）：37-43. DOI： 10.7512/j.issn.1001-2303.2024.02.06.

QU Zhiguo, WANG Dongming, ZHAO Heming, et al.Development of EH36 Thick Plate for Large Heat-input Welding and its Welding Properties[J].Electric Welding Machine, 2024, 54(2): 37-43. DOI： 10.7512/j.issn.1001-2303.2024.02.06.

摘要

在大型建筑、桥梁、造船、重型机械等领域，经常需要焊接厚钢板，使用常规的焊接方法可能会遇到焊接效率低下、焊接质量不稳定等问题。开发了一种大线能量焊接用的EH36钢板（厚80 mm），并采用线能量532 kJ/cm的双丝气电立焊进行超大线能量焊接试验。结果表明，经过大线能量焊接热循环后，粗晶热影响区不可避免地出现了粗化问题，原奥氏体平均晶粒尺寸为312 μm，通过均匀分布的复合氧化物夹杂诱导，晶内可形成针状铁素体为主+少量侧板条铁素体的组织类型，使粗晶区能够获得较理想的韧性水平。其中，在-20 ℃条件下，钢板厚度中心熔合线冲击功为70~269 J，均值为179 J；在-40 ℃条件下，钢板厚度中心熔合线冲击功为50~216 J，均值为115 J。焊接接头各位置冲击性能良好，满足EH36钢板对焊接接头冲击性能的要求。

Abstract

In the fields of large-scale construction

bridges

shipbuilding

and heavy machinery

welding of thick steel plates is often required

and problems such as low welding efficiency and unstable welding quality may be encountered using conventional welding methods. An EH36 steel plate (80 mm thick) for large wire energy welding was developed

and a large wire energy welding test was carried out by using dual-wire gas-electric riser welding with 532 kJ/cm heat-input. The results show that after the large wire energy welding thermal cycle

the coarse grain heat-affected zone is inevitably coarsened

the average grain size of the original austenite is 312 μm

and through the uniform distribution of the composite oxide inclusions induced

the intracrystalline can be formed into the organization type of acicular ferrite dominated + a small amount of lateral lath ferrite

so that the coarse grain zone can obtain a more desirable level of toughness. Among them

under the condition of -20 ℃

the fusion line impact work of steel plate thickness center is 70~269 J

with an average value of 179 J; under the condition of -40 ℃

the fusion line impact work of steel plate thickness center is 50~216 J

with an average value of 115 J. The impact performance of welded joints is good in all positions

which meets the requirements of impact performance of welded joints of EH36 steel plate.

关键词

大线能量焊接EH36钢板双丝气电立焊冲击功氧化物夹杂

Keywords

large heat-input weldingEH36 steeldouble wire gas electric vertical weldingimpact energyoxide inclusion

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