CN111215751A - 一种带铝或者铝合金镀层的钢制差强焊接部件及其制造方法 - Google Patents
一种带铝或者铝合金镀层的钢制差强焊接部件及其制造方法 Download PDFInfo
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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Abstract
一种带铝或者铝合金镀层的钢制差强焊接部件及其制造方法,该钢制差强焊接部件由高强钢板与低强钢板对焊而成,高强钢板和低强钢板包括基体及其表面上至少一个为纯铝或者铝合金镀层;高强钢板基体成分重量百分比为:C 0.08~0.8%,Si 0.05~1.0%,Mn 0.1~5%,P<0.3%,S<0.1%,Al<0.3%,Ti<0.5%,B 0.0005~0.1%,Cr 0.01~3%,余Fe及不可避免杂质;低强钢板基体成分重量百分比为:C 0.03~0.1%,Si 0~0.1%,Mn 1.0~2.0%,P<0.1%,S<0.05%,Al<0.1%,Cr 0~0.1%,Ti 0~0.05%,余Fe及不可避免杂质。本发明焊接部件焊缝热冲压后抗拉强度大于低强钢母材抗拉强度,延伸率大于4%,满足焊接部件在汽车热冲压领域的应用要求。
Description
技术领域
本发明涉及焊接部件制造,具体涉及一种带铝或者铝合金镀层的钢制差强焊接部件及其制造方法。
背景技术
在当今社会汽车越来越普及,随保有量不断的攀升,汽车的尾气排放与环境污染的矛盾越来越受到关注。减轻汽车重量可以降低油耗,减少尾气的排放,因此高强减薄成为汽车行业用材的一种发展趋势;其中,热冲压是实现零部件高强化的一种常用方式,它是通过热处理和高温成形相结合的方式来实现产品高强度;激光拼焊板热冲压,可以在减重的同时减少车身零件数量、提高制造精度。
常见的激光拼焊热冲压产品主要有:A柱、B柱、中通道等安全结构件,这些热冲压产品具有强度高、形状复杂、成形性好、尺寸精度高、回弹小、差强、差厚等特点。其中差强B柱拼焊件是汽车用材的一种发展趋势,常用组合由热冲压后其抗拉强度1300MPa~1700MPa的钢板与热冲压后其抗拉强度400MPa~700MPa的钢板拼焊而成。热冲压用钢表面状态有无镀层的裸板和带镀层的钢板,由于带镀层的热冲压钢板相对于裸板耐蚀性及抗高温氧化性好,且可以省掉热冲压后的喷丸或酸洗处理,正越来越受到重视。最常用的热成形钢有铝或者铝合金镀层热冲压钢,但这种材料焊接时镀层受焊接热作用熔化进入熔池,与铁形成脆而硬的金属间化合物(Fe3Al、Fe2Al5、FeAl3),在焊后热处理时,这些金属间化合物会进一步长大,致使焊接接头的强度、延性大幅下降,达不到车厂的使用要求。
中国专利CN101426612A公开了一种以铝硅镀层钢板为原料制造只含金属间化合物为预涂层的焊接坯件制造方法。具体为去除镀层中的铝合金层,避免过多的铝熔入熔池;保留镀层中的金属间化合物层。然后对所述焊接坯件进行焊接、热冲压。该专利尽管已去除镀层中的合金层,但因保留了金属间化合物层(保留厚度为3至10μm),仍会向焊缝导入镀层元素,控制不当易降低焊缝性能;别外,保留这几个微米的镀层,稳定实施的难度也非常高,增加了生产风险。
发明内容
本发明的目的在于提供一种带铝或者铝合金镀层的钢制差强焊接部件及其制造方法,解决高强钢板+低强钢板焊接时,因镀层元素进入焊缝,致使热冲压后的焊缝抗拉强度小于低强钢的母材强度,部件承载时焊缝断裂的问题。采用本发明获得的焊接部件其焊缝抗拉强度大于低强钢母材抗拉强度,延伸率大于4%,从而满足该种差强拼焊部件在汽车热冲压领域的应用要求。
为达到上述目的,本发明的技术方案是:
一种带铝或者铝合金镀层的钢制差强焊接部件,其由高强钢板与低强钢板对焊而成,所述的高强钢板经热冲压后抗拉强度1300MPa~1700MPa;所述的低强钢板经热冲压后抗拉强度400MPa~700MPa;其中,
所述高强钢板和低强钢板包括基体及其表面上至少一个纯铝或者铝合金镀层;所述镀层包括与所述基体接触的金属间化合物合金层及其上的金属合金层;
所述的高强钢板的基体的成分重量百分比为:C:0.08~0.8%,Si:0.05~1.0%,Mn:0.1~5%,P<0.3%,S<0.1%,Al<0.3%,Ti<0.5%,B:0.0005~0.1%,Cr:0.01~3%,其余为Fe及不可避免杂质;
所述的低强钢板的基体的成分重量百分比为:C:0.03~0.1%,Si:0~0.1%,Mn:1.0~2.0%,P<0.1%,S<0.05%,Al<0.1%,Cr:0~0.1%,Ti:0~0.05%,其余为Fe及不可避免杂质。
优选的,所述的高强钢板的基体成分重量百分比为:C:0.1~0.6%,Si:0.07~0.7%,Mn:0.3~4%,P<0.2%,S<0.08%,Al<0.2%,Ti<0.4%,B:0.0005~0.08%,Cr:0.01~2%,其余为Fe及不可避免杂质。
优选的,所述的高强钢板的基体成分重量百分比为:C:0.15~0.5%,Si:0.1~0.5%,Mn:0.5~3%,P<0.1%,S<0.05%,Al<0.1%,Ti<0.2%,B:0.0005~0.08%,Cr:0.01~1%,其余为Fe及不可避免杂质。
优选的,所述的基体厚度为0.5mm~3mm。
本发明所述的带铝或者铝合金镀层的钢制差强焊接部件的制造方法,其包括如下步骤:
1)钢板焊前准备
焊接坯料采用上述成分的带铝或者铝合金镀层的钢板,保证钢板平直、表面清洁,无油污、水渍;
2)焊接预制对接间隙
将两块待焊边的焊接钢板焊缝对接间隙保持0.2~0.5mm;
3)激光焊工艺
采用的焊接方法为激光焊填丝焊或气体保护焊;
采用激光光斑直径为1.2mm~2.0mm,离焦量为-3~0mm,激光功率控制范围4kW~6kW,焊接速度控制在40mm/s~120mm/s;焊丝直径为0.8mm~1.2mm,送丝速度为50mm/s~100mm/s;
采用99.99%的高纯氩气作为保护气体,流量为10~25L/min,送气管与焊接方向呈60度~120度将保护气体均匀稳定的送到焊接区。
本发明所述部件的焊缝抗拉强度大于低强钢母材强度,焊接接头受拉伸载荷的断裂位置为低强钢母材,接头延伸率大于4%。
本发明所述焊接部件经过热处理得到微观组织为马氏体的组织结构,但由于含铝镀层的存在,在激光焊接时铝镀层熔化后会进入焊缝,严重影响了焊接熔池内的相变过程,致使高温δ铁素体保留至室温,显著恶化了焊接接头的力学性能。所以焊接接头的质量优劣取决于焊缝组织中马氏体组织所占比例,为此需要抑制焊缝组织中高温δ铁素体的析出。
一种用于本发明所述的带铝或者铝合金镀层的钢制差强焊接部件的制造方法的焊丝,其成分重量百分比为:C 0.1~0.25%,Si 0.2~0.4%,Mn1.2~2%,P<0.03%,S<0.006%,Al<0.06%,Ti 0.02~0.08%,Cr 0.05~0.2%,余量为Fe和不可避免杂质;焊丝直径为0.8~1.4mm。
在本发明所述焊接用的焊丝的成分设计中:
硅是焊丝中的脱氧元素,它可以防止铁与氧结合,并可在熔池中还原氧化铁;然而如果单独使用硅脱氧,生成的二氧化硅熔点高(约1710℃),且该氧化物颗粒细小,难从熔池中浮出,易造成焊缝夹渣,因此本焊丝中硅的重量百分比控制在0.2-0.4%范围内。
锰是重要的淬透性元素,对焊缝的韧性有很大影响,它也是脱氧元素,但脱氧能力比硅略差,单独用锰脱氧,生成的氧化锰密度较大,不易从熔池中浮出;因此本焊丝采用硅锰联合脱氧,使脱氧产物为复合硅酸盐(MnO.SiO2),其熔点低(约为1270℃)且密度小,在熔池中能凝聚成大块熔渣,有利于上浮,达到良好的脱氧效果。另外,锰还具有脱硫功能,与硫化合生成硫化锰,可降低硫引起的热裂纹倾向。综合各方面的因素,锰在本焊丝中的重量百分比控制在1.2-2%之间。
硫在熔池中易形成硫化铁,并呈网状分布在晶粒边界,因而显著地降低焊缝韧性,因此焊丝中的硫是有害的,要严格控制其含量。
磷在钢种的强化作用仅次于碳,使钢的强度和硬度增加,磷能提高钢的抗腐蚀性能,而塑性和韧性显著降低,特别是在低温时影响更为严重,因此焊丝中的磷是有害的,要严格控制其含量。
铬能提高钢的强度和硬度而塑性和韧性降低不大。铬能增加钢的淬透性并有二次硬化作用,可提高碳钢的硬度和耐磨性而不使钢变脆。铬元素具有扩大γ相区提高淬透性各热强性的元素,减小了δ相区高温存在温度区间,促进δ→γ相变的进行,抑制了高温δ铁素体的析出。因此,在本焊丝中的铬的重量百分比控制在0.05-2%之间。
钛也是一种强烈的脱氧元素,且能与氮生成氮化钛,具有良好的固氮作用,提高焊缝金属抗氮气孔的能力。钛在焊缝组织中含量适当时,可使焊缝组织得到细化。因此,在本焊丝中钛的重量百分比分别控制在0.02-0.08%之间。
在焊接带预置焊接间隙的镀层板时,向拼焊区输送本发明含Mn、Cr、Ti等元素的焊丝,来抑制高温δ铁素体的形成。锰、铬元素具有扩大γ相区提高淬透性各热强性的元素,减小了δ相区高温存在温度区间,促进δ→γ相变的进行,抑制了高温δ铁素体的析出,从而保证焊缝组织的高马氏体转化率;钛使焊缝组织得到细化,热冲压后提高了焊缝强度,确保了焊接接头的力学性能。
根据根据国际焊接学会推荐的碳当量公式可以看出:
CE=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15(%)
根据上述公式,焊丝的引入会使焊接接头的碳当量略有升高,从而保证了接头的淬透性;另外,焊丝的填入使焊缝中的镀层成分进一步被稀释,从而有利于预防焊缝生产铁铝金属间化合物及高温铁素体相,最终保证了接头性能符合汽车行业的要求。
采用本发明方法焊接,热成形后部件焊缝的抗拉强度大于低强钢的母材抗拉强度,焊接部件承载时断裂部位发生在低强钢母材区。
本发明通过一种含Mn、Cr、Ti等元素的焊丝和高能激光焊方法相结合,通过优化焊接工艺,获得的焊接部件热冲压后其焊缝的抗拉强度大于低强钢母材抗拉强度,延伸率大于4%,从而满足该种差强焊接部件在汽车热冲压领域的应用要求。
附图说明
图1为本发明实施例焊接接头拉伸曲线;
图2为本发明实施例焊接接头拉伸断裂后的试样;
图3为本发明实施例1焊接接头金相图;
图4为本发明实施例2焊接接头金相图;
图5为本发明实施例3焊接接头金相图;
图6为本发明实施例1焊接接头硬度分布图。
具体实施方式
下面结合实施例和附图对本发明做进一步说明。
实施例1
采用高强铝硅镀热成型钢(t=1.75mm)与低强铝硅镀层热成型钢(t=1.8mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为4.5kW,光斑直径为2mm,离焦量为-2mm,焊接速度为80mm/s,焊丝直径为1.2mm,送丝速度为70mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈120度角。采用上述焊接工艺拼焊后,坯件再经过930度保温4分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4,焊接接头拉伸曲线见图1,断裂部位见图2,接头金相见图3,接头硬度见图6。
实施例2
焊接采用高强铝硅镀热成型钢(t=1.8mm)与低强铝硅镀层热成型钢(t=1.8mm)拼接,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.4mm。采用本发明开发的焊丝,激光功率为4.5kW,光斑直径为2mm,离焦量为-3m,焊接速度为80mm/s,焊丝直径为1.2mm,送丝速度为80mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈60度角。采用上述焊接工艺拼焊后,坯件再经过930度保温4分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4;焊接接头拉伸曲线见图1,断裂部位见图2,接头金相见图4。
实施例3
焊接采用高强铝硅镀热成型钢(t=1.5mm)与低强铝硅镀层热成型钢(t=1.5mm)拼接,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.25mm。采用本发明开发的焊丝,光功率为4kW,光斑直径为2mm,离焦量为-1mm,焊接速度为60mm/s,焊丝直径为1.2mm,送丝速度为60mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈120度角。采用上述焊接工艺拼焊后,坯件再经过930度保温4分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4;焊接接头拉伸曲线见图1,断裂部位见图2,接头金相见图5。
实施例4
采用高强无镀层热成型钢(t=1.4mm)与低强铝硅镀层热成型钢(t=1.8mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为4.5kW,光斑直径为2mm,离焦量为-2mm,焊接速度为80mm/s,焊丝直径为1.2mm,送丝速度为70mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈90度角。采用上述焊接工艺拼焊后,坯件再经过950度保温3分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4。
实施例5
采用高强铝硅镀层热成型钢(t=1.2mm)与低强无镀层热成型钢(t=1.4mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为4.5kW,光斑直径为1.4mm,离焦量为-1mm,焊接速度为75mm/s,焊丝直径为1.0mm,送丝速度为100mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈90度角。采用上述焊接工艺拼焊后,坯件再经过950度保温3分钟的加热处处理,在通水模具中冷却10秒中,焊接接头力学性能见表4。
实施例6
采用高强铝硅镀层热成型钢(t=1.75mm)与低强铝硅镀层热成型钢(t=1.4mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为5.5kW,光斑直径为1.4mm,离焦量为-2mm,焊接速度为120mm/s,焊丝直径为1.2mm,送丝速度为70mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈90度角。采用上述焊接工艺拼焊后,坯件再经过950度保温3分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4。
实施例7
采用高强无镀层热成型钢(t=1.8mm)与低强铝硅镀层热成型钢(t=1.4mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为4.5kW,光斑直径为2mm,离焦量为-2mm,焊接速度为100mm/s,焊丝直径为1.2mm,送丝速度为50mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈90度角。采用上述焊接工艺拼焊后,坯件再经过950度保温3分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4。
实施例8
采用高强铝硅镀层热成型钢(t=1.5mm)与低强铝硅镀层热成型钢(t=1.4mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为4.5kW,光斑直径为2.0mm,离焦量为-1mm,焊接速度为80mm/s,焊丝直径为1.2mm,送丝速度为80mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈90度角。采用上述焊接工艺拼焊后,坯件再经过950度保温3分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4。
实施例9
采用高强无镀层热成型钢(t=1.4mm)与低强铝硅镀层热成型钢(t=1.2mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为5kW,光斑直径为2mm,离焦量为-1mm,焊接速度为120mm/s,焊丝直径为1.2mm,送丝速度为50mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈90度角。采用上述焊接工艺拼焊后,坯件再经过950度保温2.5分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4。
实施例10
采用高强铝硅镀层热成型钢(t=1.2mm)与低强铝硅镀层热成型钢(t=1.8mm)拼焊,板材的化学成分见表1与表2。钢板平直,表面清洁,无油污、水渍等污染物。将高强、低强两块坯料的待焊边采用激光切割的方式进行边部准备;焊前预制对接间隙为0.3mm。采用本发明开发的焊丝,激光功率为4.5kW,光斑直径为1.4mm,离焦量为-1mm,焊接速度为80mm/s,焊丝直径为1.0mm,送丝速度为100mm/s,焊丝成分见表3。用高纯氩气作为保护气体,气体流量为15L/min,送气方向与焊接方向呈90度角。采用上述焊接工艺拼焊后,坯件再经过950度保温4分钟的加热处理,在通水模具中冷却10秒中,焊接接头力学性能见表4。
表1高强钢板成分 重量百分比(wt%)
实施例 | C | SI | Mn | P | S | Al | Ti | B | Cr |
1 | 0.15 | 0.10 | 2.90 | 0.059 | 0.038 | 0.09 | 0.090 | 0.0031 | 0.15 |
2 | 0.25 | 0.23 | 1.19 | 0.015 | 0.001 | 0.04 | 0.030 | 0.0040 | 0.27 |
3 | 0.49 | 0.50 | 2.51 | 0.024 | 0.04 | 0.08 | 0.027 | 0.0052 | 0.51 |
4 | 0.39 | 0.36 | 3.00 | 0.044 | 0.03 | 0.07 | 0.05 | 0.0062 | 0.71 |
5 | 0.50 | 0.48 | 0.50 | 0.081 | 0.02 | 0.05 | 0.20 | 0.0071 | 0.20 |
6 | 0.15 | 0.10 | 2.90 | 0.059 | 0.038 | 0.09 | 0.090 | 0.0031 | 0.15 |
7 | 0.25 | 0.23 | 1.19 | 0.015 | 0.001 | 0.04 | 0.030 | 0.0040 | 0.27 |
8 | 0.49 | 0.50 | 2.51 | 0.024 | 0.04 | 0.08 | 0.027 | 0.0052 | 0.51 |
9 | 0.39 | 0.36 | 3.00 | 0.044 | 0.03 | 0.07 | 0.05 | 0.0062 | 0.71 |
10 | 0.50 | 0.48 | 0.50 | 0.081 | 0.02 | 0.05 | 0.20 | 0.0071 | 0.20 |
表2低强钢板成分 重量百分比(wt%)
实施例 | C | SI | Mn | P | S | Al | Cr | Ti |
1 | 0.073 | 0.079 | 1.42 | 0.011 | 0.0018 | 0.031 | 0.076 | 0.002 |
2 | 0.06 | 0.199 | 0.76 | 0.015 | 0.004 | 0.046 | 0.028 | 0.004 |
3 | 0.065 | 0.185 | 0.81 | 0.024 | 0.005 | 0.071 | 0.051 | 0.007 |
4 | 0.095 | 0.065 | 0.5 | 0.01 | 0.001 | 0.053 | 0.095 | 0.045 |
5 | 0.073 | 0.079 | 1.42 | 0.011 | 0.0018 | 0.031 | 0.076 | 0.002 |
6 | 0.06 | 0.199 | 0.76 | 0.015 | 0.004 | 0.046 | 0.028 | 0.004 |
7 | 0.065 | 0.185 | 0.81 | 0.024 | 0.005 | 0.071 | 0.051 | 0.007 |
8 | 0.095 | 0.065 | 0.5 | 0.01 | 0.001 | 0.053 | 0.095 | 0.045 |
9 | 0.06 | 0.199 | 0.76 | 0.015 | 0.004 | 0.046 | 0.028 | 0.004 |
10 | 0.065 | 0.185 | 0.81 | 0.024 | 0.005 | 0.071 | 0.051 | 0.007 |
表3焊丝成分 重量百分比(wt%)
实施例 | C | SI | Mn | P | S | Al | Cr | Ti |
1 | 0.22 | 0.25 | 1.24 | 0.0087 | 0.002 | 0.0454 | 0.169 | 0.028 |
2 | 0.15 | 0.35 | 1.87 | 0.008 | 0.0018 | 0.0367 | 0.105 | 0.075 |
3 | 0.18 | 0.39 | 1.53 | 0.024 | 0.0010 | 0.057 | 0.082 | 0.051 |
4 | 0.12 | 0.29 | 1.67 | 0.03 | 0.0012 | 0.045 | 0.189 | 0.067 |
5 | 0.19 | 0.21 | 1.78 | 0.0062 | 0.005 | 0.030 | 0.052 | 0.058 |
6 | 0.22 | 0.25 | 1.24 | 0.0087 | 0.002 | 0.0454 | 0.169 | 0.028 |
7 | 0.15 | 0.35 | 1.87 | 0.008 | 0.0018 | 0.0367 | 0.105 | 0.075 |
8 | 0.18 | 0.39 | 1.53 | 0.024 | 0.0010 | 0.057 | 0.082 | 0.051 |
9 | 0.12 | 0.29 | 1.67 | 0.03 | 0.0012 | 0.045 | 0.189 | 0.067 |
10 | 0.19 | 0.21 | 1.78 | 0.0062 | 0.005 | 0.030 | 0.052 | 0.058 |
表4拼焊板热冲压后的力学性能
*采用标准拉伸试样,试样标称宽度为12.5mm,原始标距为50mm,测试抗拉强度及延伸率;
**耐蚀性试验按DIN50021、DIN50017、DIN50014标准执行。
Claims (8)
1.一种带铝或者铝合金镀层的钢制差强焊接部件,其由高强钢板与低强钢板对焊而成,所述的高强钢板经热冲压后抗拉强度为1300MPa~1700MPa;所述的低强钢板经热冲压后抗拉强度为400MPa~700MPa;其中,
所述高强钢板和低强钢板包括基体及其表面上至少一个为纯铝或者铝合金镀层;所述镀层包括与所述基体接触的金属间化合物合金层及其上的金属合金层;
所述的高强钢板的基体的成分重量百分比为:C:0.08~0.8%,Si:0.05~1.0%,Mn:0.1~5%,P<0.3%,S<0.1%,Al<0.3%,Ti<0.5%,B:0.0005~0.1%,Cr:0.01~3%,其余为Fe及不可避免杂质;
所述的低强钢板的基体的成分重量百分比为:C:0.03~0.1%,Si:0~0.1%,Mn:0.5~2.0%,P<0.03%,S<0.01%,Al<0.1%,Cr:0~0.1%,Ti:0~0.05%,其余为Fe及不可避免杂质。
2.如权利要求1所述的带铝或者铝合金镀层的钢制差强焊接部件,其特征在于,所述高强钢板的基体成分重量百分比为:C:0.1~0.6%,Si:0.07~0.7%,Mn:0.3~4%,P<0.2%,S<0.08%,Al<0.2%,Ti<0.4%,B:0.0005~0.08%,Cr:0.01~2%,其余为Fe及不可避免杂质。
3.如权利要求1所述的带铝或者铝合金镀层的钢制差强焊接部件,其特征在于,所述高强钢板的基体成分重量百分比为:C:0.15~0.5%,Si:0.1~0.5%,Mn:0.5~3%,P<0.1%,S<0.05%,Al<0.1%,Ti<0.2%,B:0.0005~0.08%,Cr:0.01~1%,其余为Fe及不可避免杂质。
4.如权利要求1或2或3所述的带铝或铝合金镀层的钢制薄壁焊接等强部件,其特征在于,所述镀层是纯铝或铝合金,其中,铝合金的成分重量比为:Si:5-11%,Fe:0-4%,余量为Al。
5.如权利要求1或2或3所述的带铝或者铝合金镀层的钢制差强焊接部件,其特征在于,所述的基体厚度为0.5mm~3mm。
6.如权利要求1~5中任何一项所述的带铝或者铝合金镀层的钢制差强焊接部件的制造方法,其包括如下步骤:
1)钢板焊前准备
焊接坯料采用上述成分的冷轧板或带铝或者铝合金镀层的钢板,保证钢板平直、表面清洁,无油污、水渍;
2)焊接预制对接间隙
将两块待焊边的焊接钢板焊缝对接间隙保持0.2~0.5mm;
3)激光焊工艺
采用的焊接方法为激光焊填丝焊或气体保护焊;
采用激光光斑直径为1.2mm~2.0mm,离焦量为-3~0mm,激光功率控制范围4kW~6kW,焊接速度控制在40mm/s~120mm/s;焊丝直径为0.8mm~1.2mm,送丝速度为50mm/s~100mm/s;
采用99.99%的高纯氩气作为保护气体,流量为10~25L/min,送气管与焊接方向呈60度~120度将保护气体均匀稳定的送到焊接区。
7.如权利要求6所述的带铝或者铝合金镀层的钢制差强焊接部件的制造方法,其特征是,所述钢制差强焊接部件的焊缝抗拉强度大于低强钢母材强度,焊接接头受拉伸载荷的断裂位置为低强钢母材,焊接接头延伸率大于4%。
8.一种用于如权利要求6所述的带铝或者铝合金镀层的钢制差强焊接部件的制造方法的焊丝,其特征是:所述焊丝的成分重量百分比为:C0.1~0.25%,Si0.2~0.4%,Mn1.2~2%,P<0.03%,S<0.006%,Al<0.06%,Ti0.02~0.08%,Cr0.05~0.2%,余量为Fe和不可避免杂质;焊丝直径为0.8-1.4mm。
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CN112404129A (zh) * | 2020-10-27 | 2021-02-26 | 苏州大学 | 一种热轧汽车用钢板的焊接方法 |
WO2022165930A1 (zh) * | 2021-02-03 | 2022-08-11 | 育材堂(苏州)材料科技有限公司 | 激光拼焊预镀层钢板及其热冲压成形构件 |
CN114959441A (zh) * | 2021-02-26 | 2022-08-30 | 宝山钢铁股份有限公司 | 一种热冲压钢板、热冲压部件及其制造方法 |
CN113118629A (zh) * | 2021-04-21 | 2021-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | 差强度激光拼焊板的制备方法 |
CN113118630A (zh) * | 2021-04-21 | 2021-07-16 | 攀钢集团攀枝花钢铁研究院有限公司 | 差厚度激光拼焊板的制备方法 |
CN113500292A (zh) * | 2021-07-28 | 2021-10-15 | 攀钢集团研究院有限公司 | 一种含钒双相钢激光拼焊板的生产方法 |
WO2023025242A1 (zh) * | 2021-08-25 | 2023-03-02 | 宝山钢铁股份有限公司 | 钢制薄壁拼焊件的制造方法及使用该拼焊件制备的热冲压部件 |
CN115446459A (zh) * | 2022-10-14 | 2022-12-09 | 中国科学院上海光学精密机械研究所 | 一种高强钢激光焊接填料、接头及方法 |
CN118492629A (zh) * | 2024-07-18 | 2024-08-16 | 上海大学 | 镀铝硅钢板激光焊接方法、焊丝以及制备工艺 |
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US20220168845A1 (en) | 2022-06-02 |
JP7343603B2 (ja) | 2023-09-12 |
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