An Analysis of Laser-Welded Nicr-Ir and Nicr-Pt Micro Joints on Spark Plug Electrodes in Biogas-Fuelled Engines

Archives of Metallurgy and Materials

Tofil Sz.¹  Napadłek W.² 

[1] KIELCE UNIVERSITY OF TECHNOLOGY, DEPARTMENT OF TEROTECHNOLOGY AND INDUSTRIAL LASER SYSTEMS, FACULTY OF MECHATRONICS AND MECHANICAL ENGINEERING, 7th TYSIĄCLECIA P.P. AV. 25-314 KIELCE, POLAND;MILITARY UNIVERSITY OF TECHNOLOGY, INSTITUTE OF MOTOR VEHICLES AND TRANSPORTATION, FACULTY OF MECHANICAL ENGINEERING, 2 GEN. SYLWESTRA KALISKIEGO STR., 00-908 WARSAW 49, POLAND;

关键词: Microwelding;    Laser;    Spark plugs;    Refractory materials;    Biogas;   

DOI  :  10.1515/amm-2016-0194

来源: DOAJ

【 摘 要 】

The paper deals with the laser beam welding of tips to central and side spark plug electrodes made of a nickel-chromium alloy. The tips attached to the central electrodes were made from a solid iridium wire 0.8 mm in diameter and 2 mm in length, while the tips connected to the side electrodes were made from a platinum wire 1.5 mm in diameter and 0.25 mm in thickness. In both cases, accurate positioning of the tips was required before they were resistance welded to the electrodes. Then, a fillet weld was produced with an Nd:YAG laser using single, partly overlapping conductive pulses. The laser welding was performed at different laser power levels and pulse durations. Metallographic sections of the joints were prepared to observe changes in the microstructure and determine their correlation with the changes in the process parameters. The results were used to select appropriate welding parameters for the materials joined. The microscopic analysis indicated welding imperfections such as micro cracks at the interface between the elements joined. The tips welded to the spark plug electrodes can help extend the service life of spark plugs in highly corrosive environments.

【 授权许可】

Unknown