CN115415642A - 一种tmcp态超高强海工钢的气保焊焊接工艺 - Google Patents
一种tmcp态超高强海工钢的气保焊焊接工艺 Download PDFInfo
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Abstract
本发明公开了一种TMCP态超高强海工钢的气保焊焊接工艺,涉及钢铁生产技术领域,焊前预热温度为80℃,道间温度为100~200℃;设计焊接间隙为4mm的焊接坡口,焊接电流250~270A,电弧电压25~30V,焊接速度19~24cm/min,线能量为16~22kJ/cm。对气保焊不同的根部间隙提出了优化措施,通过冷裂纹敏感性试验,选择合适的预热温度,大大降低了焊接缺陷的发生。
Description
技术领域
本发明涉及钢铁生产技术领域,特别是涉及一种TMCP态超高强海工钢的气保焊焊接工艺。
背景技术
超高强海洋工程用钢通常应用在海洋平台、海上低温结构、大型船舶等大型海工构件的焊接结构关键部位,其中包括自升式平台的桩腿、桩靴、悬臂梁、齿条升降机构等。因其使用地点为严峻的海洋环境,面对海潮、寒流等恶劣情况,海洋平台服役时间比船舶长50%,使用的钢板必须具有高强度、高韧性、低屈强比、抗层状撕裂、良好的焊接性能等。超高强度的690级别海工板因自身强度问题,需要采用厚度较厚的板材进行实际生产使用,但较大的厚度会导致卷曲困难,影响用户使用。
近年来,CCS等船级社规范在适用于海洋结构工程的热轧、细晶、可焊接高强度结构钢新增了最低屈服强度890N/mm2,利用890级别钢板代替690级别钢板,减小使用厚度,达到轻量化,变得十分重要。超高强海工板EH830,其Ceq=0.575%,Pcm=0.29%。当Ceq在0.4%~0.6%之间时,钢材焊接冷裂倾向较显著,焊接性较差。
发明内容
本发明针对上述技术问题,克服现有技术的缺点,提供一种TMCP态超高强海工钢的气保焊焊接工艺,焊前预热温度为80℃,道间温度为 100~200℃;设计焊接间隙为4mm的焊接坡口,焊接电流250~270A,电弧电压25~30V,焊接速度19~24cm/min,线能量为16~22kJ/cm。。
本发明进一步限定的技术方案是:
前所述的一种TMCP态超高强海工钢的气保焊焊接工艺,采用直流电源,保护气配比为98%Ar+2%O2。
前所述的一种TMCP态超高强海工钢的气保焊焊接工艺,坡口形式为V型坡口,坡口角度60°。
前所述的一种TMCP态超高强海工钢的气保焊焊接工艺,焊丝成分如下:C≤0.10%,Si≤0.90%,1.5%≤Mn≤4.0%,P≤0.020%,S≤0.020%,Ni≤3.0%,0.50%≤Mo≤0.70%。
前所述的一种TMCP态超高强海工钢的气保焊焊接工艺,焊丝直径为1.2mm。
前所述的一种TMCP态超高强海工钢的气保焊焊接工艺,应用于EH830钢板,其化学组分及质量百分比满足以下条件:0.04%≤C≤0.10%,0.15%≤Si≤0.40%,1.20%≤Mn≤1.50%,P≤0.013%,S≤0.003%,0.020%≤Nb≤0.06%,0.005%≤Ti≤0.020%,1.50%≤Ni≤2.50%,0.90%≤Cu≤1.50%,0.40%≤Mo≤0.50%,余量为Fe及不可避免的杂质。
前所述的一种TMCP态超高强海工钢的气保焊焊接工艺,EH830钢板厚度为20mm。
前所述的一种TMCP态超高强海工钢的气保焊焊接工艺,海工钢EH830的焊接接头强度>950MPa,-40℃冲击值为>59J。
本发明的有益效果是:
(1)本发明通过扩大根部间隙,加大打底焊热输入,优化填充焊的道次排布,有效提高冲击值,焊接工艺获得的焊接接头可达到与母材相匹配的使用性能,获得良好的焊接接头力学性能;
(2)本发明采用的气保焊在效率上有所提高,选择的焊材相对便宜,生产时间和成本大大降低,且焊接质量也有保障。
附图说明
图1为本发明的焊接坡口示意图。
具体实施方式
实施例1
本实施例提供的一种TMCP态超高强海工钢的气保焊焊接工艺,应用于EH830钢板,其化学组分及质量百分比满足以下条件:0.04%≤C≤0.10%,0.15%≤Si≤0.40%,1.20%≤Mn≤1.50%,P≤0.013%,S≤0.003%,0.020%≤Nb≤0.06%,0.005%≤Ti≤0.020%,1.50%≤Ni≤2.50%,0.90%≤Cu≤1.50%,0.40%≤Mo≤0.50%,余量为Fe及不可避免的杂质。EH830 钢板的力学性能:抗拉强度为996MPa,屈服强度为850MPa,延伸率A=14%;-40℃时冲击功Akv为:四分之一处137J、146J、158J,心部106J、122J、178J。
焊丝直径为Φ1.2mm,成分如下:C≤0.10%,Si≤0.90%,1.5%≤Mn≤4.0%,P≤0.020%,S≤0.020%,Ni≤3.0%,0.50%≤Mo≤0.70%。
通过试验发现若根部间隙过小,则热输入相对大间隙有所减小,同时,填充道次减少,意味着后道焊接的后热效果降低,最终导致冲击值出现不合格。设计焊接间隙为4mm的焊接坡口,焊接坡口型式为V型坡口(如附图1),坡口角度60°。焊接工艺的技术参数如下:打底时,焊接电流为250A,电弧电压为25V,焊接速度为19cm/min;填充时,焊接电流为250A,电弧电压为27V,焊接速度为20cm/min。
焊接后的金属的显微组织及力学性能分析:焊缝金属组织为贝氏体组织。经检测,没有凝固裂纹及再热裂纹产生。焊接完成的力学性能如下:
结果表明:本实施在对TMCP态EH830超高强海工钢气保焊焊接后,焊接接头力学性能也达到了830强度级别焊接的性能要求。
实施例2
本实施例提供的一种TMCP态超高强海工钢的气保焊焊接工艺,与实施例1的区别在于:焊接工艺的技术参数如下:打底时,焊接电流为250A,电弧电压为29V,焊接速度为22cm/min;填充时,焊接电流为270A,电弧电压为30V,焊接速度为24cm/min。
焊接后的金属的显微组织及力学性能分析:焊缝金属组织为贝氏体组织。经检测,没有凝固裂纹及再热裂纹产生。焊接完成的力学性能如下:
结果表明:本实施在对TMCP态EH830超高强海工钢气保焊焊接后,焊接接头力学性能也达到了830强度级别焊接的性能要求。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。
Claims (8)
1.一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:焊前预热温度为80℃,道间温度为 100~200℃;设计焊接间隙为4mm的焊接坡口,焊接电流250~270A,电弧电压25~30V,焊接速度19~24cm/min,线能量为16~22kJ/cm。
2.根据权利要求1所述的一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:采用直流电源,保护气配比为98%Ar+2%O2。
3.根据权利要求1所述的一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:坡口形式为V型坡口,坡口角度60°。
4.根据权利要求1所述的一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:焊丝成分如下:C≤0.10%,Si≤0.90%,1.5%≤Mn≤4.0%,P≤0.020%,S≤0.020%,Ni≤3.0%,0.50%≤Mo≤0.70%。
5.根据权利要求4所述的一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:焊丝直径为1.2mm。
6.根据权利要求1所述的一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:应用于EH830钢板,其化学组分及质量百分比满足以下条件:0.04%≤C≤0.10%,0.15%≤Si≤0.40%,1.20%≤Mn≤1.50%,P≤0.013%,S≤0.003%,0.020%≤Nb≤0.06%,0.005%≤Ti≤0.020%,1.50%≤Ni≤2.50%,0.90%≤Cu≤1.50%,0.40%≤Mo≤0.50%,余量为Fe及不可避免的杂质。
7.根据权利要求6所述的一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:EH830钢板厚度为20mm。
8.根据权利要求7所述的一种TMCP态超高强海工钢的气保焊焊接工艺,其特征在于:海工钢EH830的焊接接头强度>950MPa,-40℃冲击值为>59J。
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