CN107175395B - 提高Al-Cu点焊质量的方法 - Google Patents
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Abstract
本发明公开了一种提高Al‑Cu点焊质量的方法,该方法包括步骤一、按照6~10:1~3的质量比称取Mn粉和Zn粉;步骤二、将Mn粉和Zn粉按比例混合均匀,加入挥发性溶剂,调制成合金粉团;步骤三、搅动合金粉团,待其粘度为0.5~0.55Pa·s时,将合金粉团刮涂在待焊接的Al材和Cu材的搭接接头处,在Al材和Cu材形成合金粉团层;步骤四、对Al材和Cu材的搭接接头进行点焊。采用本发明的显著效果是增大了异质金属Al‑Cu之间的熔核尺寸,使熔核在Al‑Cu之间分布均匀对称,显著提高异质金属Al‑Cu之间的抗剪切性能,从而提高异质金属Al‑Cu之间点焊质量。
Description
技术领域
本发明涉及一种点焊方法,具体的,是一种Al-Cu之间点焊的前处理方法,并提高Al-Cu点焊质量。
背景技术
对于一些脆性较大的金属,在点焊时难以形成固溶体,因而焊接质量不佳。研究人员在早先的研究(《微合金化对AZ31B镁合金点焊接头组织和耐蚀性能的影响研究》发表在《热加工工艺》[2017年4月,第46卷,第7期])中发现,对于同质金属Mg之间的点焊,通过使用Cu-Al-Zn三种金属粉末,能在金属Mg的焊接接头处形成微合金化区域,从而收获熔核规则对称,熔核尺寸变大的优良效果;焊接接头的抗剪切力和耐腐蚀性也显著增加,点焊质量提高。
同时,研究人员也发现,在对异质金属之间进行点焊时,再使用Cu、Al、Zn三种金属粉末,或者其中任一种,或者其中任两种,均不能获得与同质金属Mg相同的效果。
发明内容
有鉴于此,本发明提供一种提高Al-Cu点焊质量的方法。
技术方案如下:
一种提高Al-Cu点焊质量的方法,其关键在于按以下步骤进行:
步骤一、按照6~10:1~3的质量比称取Mn粉和Zn粉;
步骤二、将Mn粉和Zn粉按比例混合均匀,加入挥发性溶剂,调制成合金粉团;
步骤三、搅动合金粉团,待其粘度为0.5~0.55Pa·s时,将合金粉团刮涂在待焊接的Al材和Cu材的搭接接头处,在Al材和Cu材的接头之间形成合金粉团层;
步骤四、对Al材和Cu材的搭接接头进行点焊。
所述步骤一中,Mn粉和Zn粉的质量比为4:1。
所述步骤二中,所述挥发性溶剂为丙酮。
所述步骤三中,所述Al材和Cu材之间刮涂的合金粉团层的总厚度为30~80μm。
所述步骤三中,在搭接接头处的Al材和Cu材的表面分别刮涂合金粉团,Al材表面合金粉团层的厚度为Cu材表面合金粉团层的厚度的2倍,Al材表面合金粉团层厚度与Cu材表面合金粉团层厚度之和为30~80μm。
所述Al材表面合金粉团层厚度与Cu材表面合金粉团层厚度之和为48~52μm。
具体实施方式
一、下面结合实施例对本发明作进一步说明。
一种提高Al-Cu点焊质量的方法,其特征在于按以下步骤进行:
步骤一、按照6~10:1~3的质量比称取Mn粉和Zn粉;
步骤二、将Mn粉和Zn粉按比例混合均匀,加入挥发性溶剂,调制成合金粉团,所述挥发性溶剂为丙酮;
步骤三、搅动合金粉团,待其粘度为0.5~0.55Pa·s时,将合金粉团刮涂在待焊接的Al材和Cu材的搭接接头处,在Al材和Cu材的搭接接头之间形成合金粉团层,所述Al材表面合金粉团层的厚度为Cu材表面合金粉团层的厚度的2倍,所述Al材表面合金粉团层厚度与Cu材表面合金粉团层厚度之和为30~80μm。
步骤四、对Al材和Cu材的搭接接头进行点焊。
二、下面结合试验例对本发明做进一步说明。
按表1配制合金粉
表1、合金粉团中Mn、Zn质量(单位:g)
取第一、二、三、四、五组的合金粉团,分别刮涂在Al板表面,刮涂面积为20mm*20mm,刮涂的合金粉团层厚度分别为30~35μm、48~52μm、60~65μm、75~80μm和48~52μm,再将Cu板贴合在Al板上,对刮涂处的搭接接头进行点焊,分别为试验组A、B、C、D、E;
取第一、二、三、四、五组的合金粉团,分别刮涂在Cu板表面,刮涂面积为20mm*20mm,刮涂的合金粉团层厚度分别为75~80μm、60~65μm、48~52μm、30~35μm和48~52μm,再将Al板贴合在Cu板上,对刮涂处的搭接接头进行点焊,分别为试验组a、b、c、d、e;
取第五组的合金粉团,在Al板上刮涂30~35μm的合金粉团层,刮涂面积为20mm*20mm,在Cu板上刮涂15~17μm的合金粉团层,刮涂面积为20mm*20mm,将Al板和Cu板上的合金粉团层对准贴合,再进行点焊,是为试验组G。
并设置以下空白组:将丙酮分别涂在Al板和Cu板的搭接面上,再进行点焊。
试验组A、B、C、D、E、a、b、c、d、e、G的焊接条件保持一致;均采用YR-A05C单相交流焊机,焊接电流18000A,焊接时间15cyc,预压时间40cyc,维持时间25cyc,电极为球面半径15mm、电极头端面直径φ15mm的标准Cu-Cr电极,电极压力0.1MPa。
焊接完成后,观察试验组A、B、C、D、E、a、b、c、d、e、G和空白组的熔核。结果为:
空白组的熔核尺寸较小,且在Al板和Cu板之间分布严重不均;
试验组A、B、C、D、E、a、b、c、d、e的熔核尺寸相较于空白组有不同程度的增大,但在Al板和Cu板之间分布也较为不均;
试验组G的熔核尺寸相较于试验组A、B、C、D、E、a、b、c、d、e的熔核尺寸进一步增大,且在Al板和Cu板之间分布均匀,以Al板和Cu板的焊接贴合面来看,熔核几乎成对称状态。
因而,试验组G的Al板和Cu板的焊接质量最高。
焊接完成后,测定焊接在一起的Al板和Cu板的最大剪切力F0,最大剪切力F0以Al板和Cu板从点焊部拉断脱离时的拉力计,结果见表2:
表2、不同组的最大剪切力F0(单位:KN)
由表2可以看出,相较于空白组,试验组A、B、C、D、E、a、b、c、d、e的Al板和Cu板的最大剪切力F0均有不同程度的提高,试验组G的Al板和Cu板的最大剪切力F0远远高于空白组,且较试验组A、B、C、D、E、a、b、c、d、e也有很大的提高,说明试验组G的Al板和Cu板的焊接质量最高。
由以上试验例可知,采用本发明的有益效果是:增大异质金属Al-Cu之间的熔核尺寸,使熔核在Al-Cu之间分布均匀对称,显著提高异质金属Al-Cu之间的抗剪切性能,从而提高异质金属Al-Cu之间焊点焊质量。
最后需要说明的是,上述描述仅仅为本发明的优选实施例,本领域的普通技术人员在本发明的启示下,在不违背本发明宗旨及权利要求的前提下,可以做出多种类似的表示,这样的变换均落入本发明的保护范围之内。
Claims (6)
1.一种提高Al-Cu点焊质量的方法,其特征在于按以下步骤进行:
步骤一、按照6~10:1~3的质量比称取Mn粉和Zn粉;
步骤二、将Mn粉和Zn粉按比例混合均匀,加入挥发性溶剂,调制成合金粉团;
步骤三、搅动合金粉团,待其粘度为0.5~0.55Pa·s时,将合金粉团刮涂在待焊接的Al材和Cu材的搭接接头处,在Al材和Cu材的接头之间形成合金粉团层;
步骤四、对Al材和Cu材的搭接接头进行点焊。
2.根据权利要求1所述的提高Al-Cu点焊质量的方法,其特征在于:所述步骤一中,Mn粉和Zn粉的质量比为4:1。
3.根据权利要求1所述的提高Al-Cu点焊质量的方法,其特征在于:所述步骤二中,所述挥发性溶剂为丙酮。
4.根据权利要求1所述的提高Al-Cu点焊质量的方法,其特征在于:所述步骤三中,所述Al材和Cu材之间刮涂的合金粉团层的总厚度为30~80μm。
5.根据权利要求1所述的提高Al-Cu点焊质量的方法,其特征在于:所述步骤三中,在搭接接头处的Al材和Cu材的表面分别刮涂合金粉团,Al材表面合金粉团层的厚度为Cu材表面合金粉团层的厚度的2倍,Al材表面合金粉团层厚度与Cu材表面合金粉团层厚度之和为30~80μm。
6.根据权利要求5所述的提高Al-Cu点焊质量的方法,其特征在于:所述Al材表面合金粉团层厚度与Cu材表面合金粉团层厚度之和为48~52μm。
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