发布时间:2017/8/25 15:15:21 作者:孟宪伟 【字体:
大 中 小】
孟宪伟
(中车南京浦镇车辆有限公司,江苏 南京 266111)
摘要:风一方面加快了熔焊时的冷凝速度,另一方面风影响氩气对熔滴与熔池的保护,从而显著地降低接头的力学性能。中车南京浦镇车辆有限公司设计了可调节风的速度的环境实验室,在20℃条件下,设计了0 m/s、1 m/s、2 m/s的风速,对A5083铝合金焊接接头进行焊接,测试不同条件下焊接接头的拉伸强度、冲击韧性、硬度以及显微组织。研究结果表明,随着风速的提高,接头的抗拉强度和冲击韧性下降,但显微硬度并未发生大的变化。接头微观组织变得更加粗糙,甚至还出现了显微裂纹缺陷,这证明风的存在,显著地会降低接头的宏观力学性能,但对微区性能改变不大。
关键词:A5083铝合金;环境风速;力学性能;微观组织
中图分类号:TU512.4 文献标志码:A doi:10.3969/j.issn.1006-0316.2017.08.007
文章编号:1006-0316 (2017) 08-0031-03
Effect of Wind on Mechanical Properties and Microstructure of Welded Joints of A5083 Aluminum Alloys
MENG Xianwei
( CRRC Nanjing Puzhen Co., Ltd., Nanjing 266111, China )
Abstract:The wind would accelerate the condensation rate during the welding process and would influence the protection results of droplets and molten pools and then decrease the mechanical properties. The environment laboratory was established and the 0 m/s、1 m/s、2 m/s wind velocity was designed to welding A5083 aluminum alloys. The results of tensile strength, impact toughness, microstructure and microhardness showed that the tensile strength and impact toughness were decreased but the mocrohardness did not changed much. The microstructure became much coarse with some tiny microcracks occored. It manifested that the wind have great effect on the mechanical properties of welded joints.
Key words:A5083 aluminum alloys;wind;mechanical properties;microstructure
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收稿日期:2017-01-15
作者简介:孟宪伟(1984-),男,内蒙古赤峰人,硕士,工程师,主要从事车体组焊工艺工作。