電阻點銲電流及通電時間對銲接點之研究

隨者大眾的安全意識逐漸提高，為提升車輛結構安全性在汽車工業上開始大量採用高張力鋼板並應用於車體結構上，隨著新材料的使用對於電阻點銲其銲接品質保證也相對提高其困難度。本研究選用JSC980Y之高張力鋼板，以（4.0 KA、5.0 KA、6.0 KA、7.0 KA）之銲接電流，配合一段式及二段式銲接模式操作，探討二種操作模式對高張力鋼板銲接效果之影響。實驗結果顯示在二段式銲接模式相較於一段式下可有效提高，銲徑尺寸成長達13.05 ％，拉剪試驗二段式較一段式可提升28.07 ％負荷，隨著銲核成長接近電極端部面徑大小後開始放緩，以超音波儀器測試銲點皆可保持良好，並無過燒及壓痕過深等問題。

關鍵字

電阻點銲；銲接品質；高張力鋼板

並列摘要

Recently, safety driving has become a key issue which leads the automotive industry put more effects on the body structure. Accordingly, the motor factory starts to use high-tensile steel on the body shell and panels for achieving its rigidity on mechanism of the car. However, these new materials on resistance wielding are getting better but difficult to guarantee their quality. The purpose of this research is to identify the quality of the high-tensile steel (model name JSC980Y ), where 4 different types（4.0 KA、5.0 KA、6.0 KA、7.0 KA）of the wielding current and the bridge spot welding by using single-stage and two-stage operating modes have been used. Results of the experiments show that when the wieldable dimensions up to 13.05%, the two-stage operating modes perform better than single-stage counterparts. Furthermore, the two-stage-operating schemes perform better than the single-stage ones for upgrading 28.07% load under the tensile-shearing experiment. Finally, by nugget forming grew-up until their dimensions have the same as the electronic tip, the test performance by using the ultrasonic equipment shows that there is no any damage.

並列關鍵字

Resistance spot welding ； Wielding quality ； High strength steel

參考文獻

[1] D. S. Safanama, S. P. H. Marashi, M. Pouranvari, “Similar and dissimilar resistance spot welding of martensitic advanced high strength steel and low carbon steel:metallurgical characteristics and failure mode transition”, Science and Technology of Welding and Joining, vol.17, pp.288-294, 2012.