CN114850728B - 一种适用于7a52高强铝合金的焊丝及焊接方法 - Google Patents
一种适用于7a52高强铝合金的焊丝及焊接方法 Download PDFInfo
- Publication number
- CN114850728B CN114850728B CN202210565159.2A CN202210565159A CN114850728B CN 114850728 B CN114850728 B CN 114850728B CN 202210565159 A CN202210565159 A CN 202210565159A CN 114850728 B CN114850728 B CN 114850728B
- Authority
- CN
- China
- Prior art keywords
- welding
- percent
- wire
- equal
- aluminum alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003466 welding Methods 0.000 title claims abstract description 123
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 28
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 239000010953 base metal Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000000137 annealing Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000010622 cold drawing Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910017706 MgZn Inorganic materials 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001887 electron backscatter diffraction Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/28—Selection of soldering or welding materials proper with the principal constituent melting at less than 950 degrees C
- B23K35/286—Al as the principal constituent
- B23K35/288—Al as the principal constituent with Sn or Zn
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
本发明公开了一种适用于7A52高强铝合金的焊丝及焊接方法,其中焊丝及焊接方法适用于10mm~60mm厚7A52高强铝合金焊接,其中焊丝化学成分按重量百分比为:Si:≤0.10%,Mn:0.5%~1.0%,Cr:0.15%~0.20%,Cu:≤0.04%,Fe:0.10%~0.20%,Mg:5.3%~5.8%,Zn:≤0.15%,Ti:0.15%~0.20%,Zr:0.10%~0.15%,其余为Al及不可避免的杂质元素。本申请中采用双丝双脉冲焊接方法,选择合适的焊接工艺,获得了高质量的焊接接头,其中接头抗拉强度≥335MPa,焊接接头强度系数≥0.80,焊接效率提高35%以上。从而使得所述焊丝和焊接方法应用于7A52高强铝合金的焊接具有巨大的潜力。
Description
技术领域
本发明涉及材料加工技术领域,尤其涉及一种适用于7A52高强铝合金的焊丝及焊接方法。
背景技术
7A52铝合金是可热处理强化的7系铝合金,经固溶和时效处理后强度≥410MPa,现已广泛用于飞机机身结构、特殊车辆、铁路运输和低温压力容器等领域的大型结构件中。对于这些大型结构件,采用传统的制造方法(铸造、锻压等)不能一体化加工成形,只能通过焊接进行连接制造,因此焊接技术成为了一种重要的材料加工方法。但铝合金由于熔点低、导热快,采用传统的焊接方法(直流MIG、TIG以及脉冲模式),焊接效率低,焊后母材变形严重,同时由于焊接线能量较大导致焊缝组织晶粒粗大,热影响区软化严重,极大地降低了焊接接头的力学性能,从而也限制了7A52高强铝合金的使用。
发明内容
本发明的目的是提供一种适用于7A52高强铝合金的焊丝及焊接方法,解决常规7A52高强铝合金在焊接中存在背景技术中提出的问题。
为解决上述技术问题,本发明采用如下技术方案:
本发明提供了一种适用于7A52高强铝合金的焊丝,其化学成分按重量百分比为:Si:≤0.10%,Mn:0.5%~1.0%,Cr:0.15%~0.20%,Cu:≤0.04%,Fe:0.10%~0.20%,Mg:5.3%~5.8%,Zn:≤0.15%,Ti:0.15%~0.20%,Zr:0.10%~0.15%,其余为Al及不可避免的杂质元素;其中焊丝经过铸锭制备、热挤压、轧制、中间退火、光亮冷拔步骤进行加工制得,具体为常规焊丝加工工艺。
并经过以下步骤制得丝径为1.2mm和1.6mm的焊丝:
其经过铸锭制备、热挤压、轧制、中间退火、光亮冷拔步骤。
本申请通过焊丝成分设计解决上述背景技术中存在的问题;其中Mg元素是7A52铝合金中重要的固溶强化元素,能与Zn元素形成强化相MgZn2;
但是在采用双丝双脉冲焊接过程中,焊缝总热输入增加,导致Mg元素蒸发严重,减弱了Mg元素强化作用;
本申请中通过提高Mg元素含量(5.3%~5.8%),从而保证Mg元素固溶强化效果。
另外,本申请中同时该焊丝组分中添加有一定比例的Ti(0.15%~0.20%)和微量稀土元素Zr(0.10%~0.15%);其中Ti与Zr能够产生复合微合金化,形成Al3(Zr,Ti)弥散相,该弥散相与Al基体的错配度很小,从而能够细化晶粒和抑制再结晶,提高合金的热稳定性,进而提高材料的力学性能。
本发明提供了一种适用于7A52高强铝合金的焊接方法,其应用上述的适用于7A52高强铝合金的焊丝,
采用双丝双脉冲焊接方法:
其中主丝为脉冲(P)焊接模式,焊接电流为240A~330A,焊接电压为23.3V~25.3V;副丝为冷金属过渡(CMT)+脉冲(P)焊接模式,焊接电流为100A~160A,焊接电压为18.2V~20.1V;
焊接速度为0.48m/min~0.72m/min,送丝速度为22m/min~30m/min;
保护气体为50%He+50%Ar,气体流量为18~22L/min,道间温度≤80℃。
本申请中所述主丝为脉冲(P)焊接模式,是通过主丝脉冲(P)大电流射流过渡方式,从而提高金属熔敷效率,以获得大熔深、高熔敷量;所述副丝为冷金属过渡(CMT)+脉冲(P)焊接模式实现焊缝成形精度和降低热输入,并且利用脉冲(P)焊接能够对熔池产生搅拌作用,从而助于减少焊缝缺陷,细化焊缝晶粒,而提高焊缝强度。
本实施例中,进一步地优化,其适用于10mm~60mm厚的7A52高强铝合金焊接。
本实施例中,再进一步地优化,其中焊接坡口为“V”型或“X”型坡口,坡口角度为70°~90°,钝边≤1mm;从而使得焊接接头的抗拉强度≥335MPa,接头强度系数≥0.80,焊接效率提高35%以上。
本实施例中,再进一步地优化,其中焊接坡口的角度具体设计为80°。
与现有技术相比,本发明的有益技术效果:本申请中采用双丝双脉冲焊接方法,选择合适的焊接工艺,获得了高质量的焊接接头,其中接头抗拉强度≥335MPa,焊接接头强度系数≥0.80,焊接效率提高35%以上。从而使得所述焊丝和焊接方法应用于7A52高强铝合金的焊接具有巨大的潜力。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为中厚板7A52焊接宏观示意图;
图2为焊接接头焊缝区组织金相图;
图3为焊接接头焊缝区组织EBSD图;
图4为焊缝区Al3(Zr,Ti)相TEM图。
具体实施方式
实施例1
本实施例中采用本发明焊丝进行40mm厚7A52高强铝合金双丝双脉冲焊接实验,焊丝化学成分按重量百分比为:Si:0.05%,Mn:0.60%,Cr:0.16%,Cu:0.04%,Fe:0.12%,Mg:5.3%,Zn:0.08%,Ti:0.16%,Zr:0.10%,其余为Al及不可避免的杂质元素。实验前对焊接坡口进行打磨、清理,去除表面氧化膜,并用丙酮去除油污,双丝双脉冲焊接工艺参数如表1所示。焊接接头宏观如图1所示,焊缝表面成形良好,截面无宏观气孔、裂纹产生,母材几乎无变形。焊缝区组织呈等轴状生长(如图2和图3所示),平均晶粒尺寸约为32μm。焊缝区还出现球形状Al3(Zr,Ti)相(如图4所示),尺寸约为50nm~100nm,纳米级Al3(Zr,Ti)相能够显著细化晶粒,提高接头强度。焊接接头抗拉强度为339MPa,接头强度系数为0.82。作为对比示例,采用普通直流MIG进行40mm厚7A52高强铝合金焊接,在相同焊接工艺参数下(送丝速度仅有19.4m/min),焊接接头抗拉强度仅为285MPa。对比之下,本发明焊接效率提高了41%,实现了高质量与高效率焊接。
表1双丝双脉冲焊接工艺参数
实施例2
采用本发明焊丝进行40mm厚7A52高强铝合金双丝双脉冲焊接实验,焊丝化学成分按重量百分比为:Si:0.05%,Mn:0.60%,Cr:0.16%,Cu:0.04%,Fe:0.15%,Mg:5.5%,Zn:0.10%,Ti:0.18%,Zr:0.12%,其余为Al及不可避免的杂质元素。实验前对焊接坡口进行打磨、清理,去除表面氧化膜,并用丙酮去除油污。双丝双脉冲焊接工艺参数如表2所示。焊缝区组织呈等轴状,随着Zr、Ti含量增加,纳米级的Al3(Zr,Ti)数量增加,细化晶粒效果更加明显,平均晶粒尺寸约为28μm,提高了焊接接头的抗拉强度。本实施例中接头抗拉强度为345MPa,接头强度系数为0.84,焊接效率提高37%(直流MIG送丝速度18.9m/min)。
表2双丝双脉冲焊接工艺参数
实施例3
采用本发明焊丝进行40mm厚7A52高强铝合金双丝双脉冲焊接实验,焊丝化学成分按重量百分比为:Si:0.07%,Mn:0.8%,Cr:0.15%,Cu:0.02%,Fe:0.14%,Mg:5.8%,Zn:0.07%,Ti:0.18%,Zr:0.14%,其余为Al及不可避免的杂质元素。实验前对焊接坡口进行打磨、清理,去除表面氧化膜,并用丙酮去除油污。本实施例双丝双脉冲焊接工艺参数如表3所示。母材几乎无变形,焊缝成形效果较好,焊缝区平均晶粒尺寸约为24μm。焊接接头具有良好的拉伸性能,抗拉强度达到351MPa,接头强度系数为0.85,焊接效率提高55%(直流MIG送丝速度15.6m/min)。
表3双丝双脉冲焊接工艺参数
实施例4
采用本发明焊丝进行40mm厚7A52高强铝合金双丝双脉冲焊接实验,焊丝化学成分按重量百分比为:Si:0.03%,Mn:0.90%,Cr:0.18%,Cu:0.03%,Fe:0.18%,Mg:5.4%,Zn:0.13%,Ti:0.20%,Zr:0.15%,其余为Al及不可避免的杂质元素。实验前对焊接坡口进行打磨、清理,去除表面氧化膜,并用丙酮去除油污。双丝双脉冲焊接工艺参数如表4所示。母材几乎无变形,焊缝表面成形较好,截面无缺陷产生。焊缝区晶粒长大,平均晶粒尺寸约为35μm,由于焊接电流较大,组织中Al3(Zr,Ti)相发生粗化,其尺寸约为200nm。焊接接头抗拉强度为344MPa,接头强度系数为0.84,焊接效率提高53%(直流MIG送丝速度为17.8m/min)。
表4MIG脉冲焊接工艺参数
Claims (4)
1.一种适用于7A52高强铝合金的焊接方法,其特征在于:采用双丝双脉冲焊接方法:
其中主丝为脉冲(P)焊接模式,焊接电流为240A~330A,焊接电压为23.3V~25.3V;副丝为冷金属过渡(CMT)+脉冲(P)焊接模式,焊接电流为100A~160A,焊接电压为18 .2V~20.1V;
焊接速度为0.48m/min~0.72m/min,送丝速度为22m/min~30m/min;
保护气体为50%He+50%Ar,气体流量为18~22L/min,道间温度≤80℃;
其中焊丝的化学成分按重量百分比为:Si:≤0.10%,Mn:0.5%~1.0%,Cr:0.15%~0.20%,Cu:≤0.04%,Fe:0.10%~0.20%,Mg:5.3%~5.8%,Zn:≤0.15%,Ti:0.15%~0.20%,Zr:0.10%~0.15%,其余为Al及不可避免的杂质元素;
焊接接头的抗拉强度≥335MPa,接头强度系数≥0.80,焊接效率提高35%以上。
2.根据权利要求1所述的适用于7A52高强铝合金的焊接方法,其特征在于:其适用于10mm~60mm厚的7A52高强铝合金焊接。
3.根据权利要求1所述的适用于7A52高强铝合金的焊接方法,其特征在于:其中焊接坡口为“V”型或“X”型坡口,坡口角度为70°~90°,钝边≤1mm。
4.根据权利要求3所述的适用于7A52高强铝合金的焊接方法,其特征在于:其中焊接坡口的角度为80°。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210565159.2A CN114850728B (zh) | 2022-05-23 | 2022-05-23 | 一种适用于7a52高强铝合金的焊丝及焊接方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210565159.2A CN114850728B (zh) | 2022-05-23 | 2022-05-23 | 一种适用于7a52高强铝合金的焊丝及焊接方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN114850728A CN114850728A (zh) | 2022-08-05 |
CN114850728B true CN114850728B (zh) | 2023-10-31 |
Family
ID=82638686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202210565159.2A Active CN114850728B (zh) | 2022-05-23 | 2022-05-23 | 一种适用于7a52高强铝合金的焊丝及焊接方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN114850728B (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116000498B (zh) * | 2022-12-27 | 2023-12-01 | 东北轻合金有限责任公司 | 一种高强熔焊用Al-Mg-Mn-Zn-Zr焊丝合金铸锭的制备方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102974955A (zh) * | 2012-12-04 | 2013-03-20 | 中国人民解放军装甲兵工程学院 | 一种磁控焊接熔敷成形制备高强铝合金接头的焊接丝材 |
CN105252167A (zh) * | 2015-11-05 | 2016-01-20 | 浙江大学 | 一种高韧性高强度铝合金焊丝 |
CN110026651A (zh) * | 2019-03-29 | 2019-07-19 | 武汉船用机械有限责任公司 | 双丝焊接方法 |
CN114289823A (zh) * | 2021-12-30 | 2022-04-08 | 华南理工大学 | 一种提高7075-t6超硬铝合金厚板熔焊接头性能的方法 |
-
2022
- 2022-05-23 CN CN202210565159.2A patent/CN114850728B/zh active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102974955A (zh) * | 2012-12-04 | 2013-03-20 | 中国人民解放军装甲兵工程学院 | 一种磁控焊接熔敷成形制备高强铝合金接头的焊接丝材 |
CN105252167A (zh) * | 2015-11-05 | 2016-01-20 | 浙江大学 | 一种高韧性高强度铝合金焊丝 |
CN110026651A (zh) * | 2019-03-29 | 2019-07-19 | 武汉船用机械有限责任公司 | 双丝焊接方法 |
CN114289823A (zh) * | 2021-12-30 | 2022-04-08 | 华南理工大学 | 一种提高7075-t6超硬铝合金厚板熔焊接头性能的方法 |
Non-Patent Citations (1)
Title |
---|
韩善果等.双丝CMT焊接参数对1561铝合金焊接接头力学性能和组织的影响.焊接.2016,(05),第31页右栏倒数第1段至第32页右栏第1段. * |
Also Published As
Publication number | Publication date |
---|---|
CN114850728A (zh) | 2022-08-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3815837A1 (en) | Different-strength steel welding component with aluminum or aluminum-alloy plating and method for manufacturing same | |
KR100192936B1 (ko) | 초경강도 알루미늄기 합금 | |
EP3812079A1 (en) | Method for manufacturing equal-strength steel thin-wall welding component with aluminum or aluminum-alloy plating | |
US20170304958A1 (en) | Aluminum welding filler metal, casting and wrought metal alloy | |
CN110066932A (zh) | 一种中强可焊耐蚀6xxx系铝合金及其制备方法 | |
US5512241A (en) | Al-Cu-Li weld filler alloy, process for the preparation thereof and process for welding therewith | |
Zhang et al. | Research and development of welding methods and welding mechanism of high-entropy alloys: A review | |
CN101704169A (zh) | 时效马氏体不锈钢气体保护焊用焊丝 | |
US20170136584A1 (en) | Aluminum Welding Filler Metal | |
CN114850728B (zh) | 一种适用于7a52高强铝合金的焊丝及焊接方法 | |
CN114525429B (zh) | 一种高强钛合金及其增材制备方法 | |
Sokoluk et al. | High strength nanotreated filler material for TIG welding of AA6061 | |
CN116497251B (zh) | 可减少焊缝液化裂纹的6xxx铝合金板材、其制备方法及应用 | |
EP4299777A1 (en) | Wrought aluminum alloy material for welding, aluminum alloy welded body and method for welding same | |
WO2021233228A1 (zh) | 一种气体保护焊丝用盘条及一种气体保护焊丝 | |
CN108608098A (zh) | 一种焊丝及轨道车体用铝合金焊接方法 | |
CN112171105B (zh) | 铝合金包覆材 | |
JP2018168468A (ja) | アルミニウム合金クラッド材及びその製造方法 | |
AU2017204285A1 (en) | Aluminum welding filler metal, casting and wrought metal alloy | |
Wang et al. | Laser-MIG arc hybrid brazing-fusion welding of Al alloy to galvanized steel with different filler metals | |
Ishchenko | High-strength aluminium alloys for welded structures in the aircraft industry | |
JP2002371338A (ja) | レーザー溶接部の靭性に優れた鋼 | |
CN115401293B (zh) | 一种可mig焊接异种铝合金的铝镁硅挤压板的应用 | |
CN113512670B (zh) | 可焊接的铸造高温合金及其应用 | |
CN111321323A (zh) | 一种芯材合金、包含该芯材合金的铝合金复合板材及其制备方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant |