Jointing of steel wire by ultra-high frequency induction heating

• Main Authors: Cheng-Yu Huang, 黃晟瑜
• Other Authors: 陳永傳
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/00756544782992649968

碩士 === 國立臺灣大學 === 機械工程學研究所 === 97 === The ultra-high-frequency induction heating characterized as its high heating rate, short treating time, and effective heating on miniature tools. The joining stainless steel wire and carbon steel wire by ultra-high frequency induction heating has been studied in the article. The experiment in this study is divided into two parts: (1) Induction welding： 1. 202 stainless steel 2. extremely low carbon steel 3. piano wire (2) Induction brazing with Cu filler metal： 1. 202 stainless steel / extremely low carbon steel 2. 202 stainless steel / 304 stainless steel The effects of different parameters on the mechanical properties/microstructures of the joint parts were investigated for evaluation of the feasibility. The results of the study are shown as follows: 1. The microstructures of the joint for 202 stainless steel wire after induction welding were austenite and ferrite. Moreover, when heating temperature or heating time increased, ferrite also increased. The tensile strength of the joint was superior with higher heating temperature. 2. The microstructures of the joint for extremely low carbon steel wire after induction welding were pearlite and ferrite. Moreover, The tensile strength of the jointed part was higher than the tensile strenth in the matrix of extremely low carbon steel wire. 3. The microstructure of the joint for piano wire after induction welding and high temperature tempering was tempered martensite. Moreover, The tensile strength of the jointed part was higher than the others parts of the workpiece. 4. The tensile strength of the jointed part of brazing 202 stainless steel wire and extremely low carbon steel wire with Cu filler metal was best at 950℃ for 10 seconds, higher than the tensile strength in the matrix of extremely low carbon steel wire. 5. The tensile strength of the jointed part of brazing 202 and 304 stainless steel wire with Cu filler metal by induction heating would be higher under fixed temperature for longer time. Moreover, when heating temperature was higher, there would be welding at the center of the joint, and increasing the strength of the joint significantly.