铝合金与钢CMT焊接及接头腐蚀行为
发布时间：2019-06-18 22:45
【摘要】：本文以4mm厚的5083铝合金和EH36钢板为研究对象,以ER4043铝硅焊丝和ER5183铝镁焊丝为填充金属,利用CMT焊接技术分别对铝合金/镀锌钢、铝合金/钎剂涂层钢板进行工艺性试验,采用SEM、EDS等方法对焊接接头的组织和性能进行了研究。通过工艺试验探究,确定铝合金/钢CMT焊接工艺参数为:送丝速度为3.2m/min,焊接速度为250mm/min,焊接电流65A,电弧电压14.5V,协同脉冲频率为5HZ,脉冲修正为2。首先在CMT电弧条件下做润湿铺展试验。分析对比钎料种类和钢表面状态以及焊接参数对钎料铺展的影响。结果表明:当钢板既没有镀锌层有没有钎剂涂层时,无论增加燃弧时间或送丝速度都不会对钎料的铺展起到明显的作用;当钢板上镀锌时,增加燃弧时间或送丝速度都可以促进AlSi5和AlMg5钎料的铺展;当钢板上涂有钎剂时,增加燃弧时间或送丝速度都会促进AlSi5钎料铺展,延长燃弧时间不如增加送丝速度对促进AlMg5钎料铺展的效果明显。在进行铝合金和镀锌钢的CMT焊接时,使用铝硅焊丝和铝镁焊丝都可以得到成形良好的熔钎焊接头。AlSi5焊丝焊接而成的接头强度可达到159MPa,化合物厚约2.8μm~7.1μm;AlMg5焊丝焊接而成的接头强度只有40MPa,接头界面区生成的金属间化合物厚约38.6μm~48.6μm。在焊接铝合金和钎剂涂层钢时,使用AlSi5焊丝可以得到成形较好的熔钎焊接头,但是使用AlMg5焊丝时焊缝成形不佳。AlSi5焊丝焊接而成的接头由于工艺因素会产生未熔合,强度可达到82MPa;使用AlMg5焊丝焊接时,因为熔池较轻,钎剂难以上浮,阻碍了界面反应造成虚焊,接头强度只有10MPa。电化学试验测试结果显示,铝/钢熔钎焊接头的耐蚀性介于钢母材和铝母材之间,使用AlMg5焊丝焊接得到的接头耐蚀性比使用AlSi5焊丝的好,而钢板表面状态对接头的腐蚀行为影响不大。
[Abstract]:In this paper, 4mm thick 5083 aluminum alloy and EH36 steel plate were taken as the research object, ER4043 aluminum-silicon welding wire and ER5183 aluminum-magnesium welding wire were used as filling metals. The technological properties of aluminum alloy / galvanized steel and aluminum alloy / flux coated steel plate were tested by CMT welding technology. The microstructure and properties of the welded joint were studied by SEM,EDS and other methods. Through the investigation of process test, the welding process parameters of aluminum alloy / steel CMT are determined as follows: wire feeding speed 3.2 m min, welding speed 250 mm min, welding current 65 A, arc voltage 14.5 V, cooperative pulse frequency 5Hz, pulse correction 2. Firstly, the wetting spreading test is carried out under the condition of CMT arc. The effects of solder type, steel surface state and welding parameters on solder spreading were analyzed and compared. The results show that when there is no solder coating in galvanized steel plate, no matter how much arc time or wire feeding speed is increased, it will not play an obvious role in the spreading of solder, and when galvanized steel plate, increasing arc time or wire feeding speed can promote the spread of AlSi5 and AlMg5 solder. When the solder is coated on the steel plate, increasing the arc time or wire feeding speed will promote the spread of AlSi5 solder, and prolonging the arc time is not as effective as increasing the wire feeding speed to promote the spread of AlMg5 solder. When CMT welding of aluminum alloy and galvanized steel is carried out, a well-formed brazing joint can be obtained by using aluminum-silicon wire and aluminum-magnesium welding wire. The joint strength of AlSi5 wire can reach 159 MPA, the thickness of compound is about 2.8 渭 m ~ 7.1 渭 m, the joint strength of AlMg5 wire is only 40 MPA, and the thickness of intermetallic compound formed in the interface zone of the joint is about 38.6 渭 m ~ 48.6 渭 m. When welding aluminum alloy and flux coated steel, the weld brazing joint can be obtained by using AlSi5 wire, but the weld forming is not good when AlMg5 wire is used. The joint welded by Alsi 5 wire can produce unfusion due to technological factors, and the strength can reach 82 MPA. When welding with AlMg5 wire, it is difficult to float because of the light molten pool, which hinders the interface reaction to cause false welding, and the strength of the joint is only 10 MPA. The results of electrochemical test show that the corrosion resistance of aluminum / steel brazed joint is between the steel base metal and aluminum base metal. The corrosion resistance of the joint welded with AlMg5 wire is better than that with AlSi5 wire, but the surface state of steel plate has little effect on the corrosion behavior of the joint.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG454
本文编号：2501854
[Abstract]:In this paper, 4mm thick 5083 aluminum alloy and EH36 steel plate were taken as the research object, ER4043 aluminum-silicon welding wire and ER5183 aluminum-magnesium welding wire were used as filling metals. The technological properties of aluminum alloy / galvanized steel and aluminum alloy / flux coated steel plate were tested by CMT welding technology. The microstructure and properties of the welded joint were studied by SEM,EDS and other methods. Through the investigation of process test, the welding process parameters of aluminum alloy / steel CMT are determined as follows: wire feeding speed 3.2 m min, welding speed 250 mm min, welding current 65 A, arc voltage 14.5 V, cooperative pulse frequency 5Hz, pulse correction 2. Firstly, the wetting spreading test is carried out under the condition of CMT arc. The effects of solder type, steel surface state and welding parameters on solder spreading were analyzed and compared. The results show that when there is no solder coating in galvanized steel plate, no matter how much arc time or wire feeding speed is increased, it will not play an obvious role in the spreading of solder, and when galvanized steel plate, increasing arc time or wire feeding speed can promote the spread of AlSi5 and AlMg5 solder. When the solder is coated on the steel plate, increasing the arc time or wire feeding speed will promote the spread of AlSi5 solder, and prolonging the arc time is not as effective as increasing the wire feeding speed to promote the spread of AlMg5 solder. When CMT welding of aluminum alloy and galvanized steel is carried out, a well-formed brazing joint can be obtained by using aluminum-silicon wire and aluminum-magnesium welding wire. The joint strength of AlSi5 wire can reach 159 MPA, the thickness of compound is about 2.8 渭 m ~ 7.1 渭 m, the joint strength of AlMg5 wire is only 40 MPA, and the thickness of intermetallic compound formed in the interface zone of the joint is about 38.6 渭 m ~ 48.6 渭 m. When welding aluminum alloy and flux coated steel, the weld brazing joint can be obtained by using AlSi5 wire, but the weld forming is not good when AlMg5 wire is used. The joint welded by Alsi 5 wire can produce unfusion due to technological factors, and the strength can reach 82 MPA. When welding with AlMg5 wire, it is difficult to float because of the light molten pool, which hinders the interface reaction to cause false welding, and the strength of the joint is only 10 MPA. The results of electrochemical test show that the corrosion resistance of aluminum / steel brazed joint is between the steel base metal and aluminum base metal. The corrosion resistance of the joint welded with AlMg5 wire is better than that with AlSi5 wire, but the surface state of steel plate has little effect on the corrosion behavior of the joint.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG454
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相关期刊论文 前4条
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