레이저 용접시 분광학적 수법에 의한 증발입자의 거동과 플라즈마 물성의 계측

Evaporating Particle Behaviors and plasma Parameters by Spectroscopic Method in laser Welding

  • 김윤해 (한국해양대학교 기계소재공학과)
  • 발행 : 1999.07.01

초록

The laser-induced plasma affects greatly on the results of welding process. moreover selective evaporation loss of alloying elements leads to change in chemical composition of weld metal as well as the mechanical properties of welded joint. this study was undertaken to obtain a fundamental knowledge of pulsed laser welding phenomena especially evaporation mechanism of different aluminum alloys. The intensities of molecular spectra of AlO and MgO were different each other depeding on the power density of a laser beam Under the low power density condition the MgO band spectrum was predominant in intensity while the AlO spectra became much stronger with an increase in the power density. These behaviors have been attributed to the difference in evaporation phenomena of Al and Mg metals with different boiling points and latent heats of vaporization. The time-averaged plasma temperature and electron number density were determined by spectroscopic methods and consequently the obtained temperature was $3,280{\pm}150K$ and the electron number density was $1.85{\times}10^{19}\;l/m^3$.

키워드

참고문헌

  1. 한국박용기관학회지 v.22-6 레이저 용접현상과 산업계로의 응용 김종도;松繩 朗
  2. 한국박용기관학회지 v.23-3 펄스 YAG 레이저 용접시 유기하는 플라즈마의 스펙크럼선 동정과 발광특성 김종도
  3. 金屬デ-タプツク(3版) 日本金屬學會
  4. Atomic Energy Level(Circular of the National Bureau of Standard 467 v.Ⅰ C.E.Moore
  5. 日本 溶接學會 全國大會 講演槪要 v.57 レ-ザ深溶み溶接時のプル-ムとキ-ホル學動 金鍾道;片山 聖二;竹本 正;松繩 朗
  6. The Identification of Molecular Spectra R.W.B.Pearse;A.G.Gaydon
  7. Plasma Spectroscopy H.R.Grim
  8. Spectrochimica Acta v.33B A Spectrometric Study of a 40-MHz Inductively Coupled Plasma-Ⅲ. Temperature and Electron Number Density J.Jarosz;J.M.Mermet;J.P.Robin
  9. NBS Monograph 53 Experimental Transition Probabilities for Spectral Lines of Seventy Element C.H.Corliss;W.R.Bozman
  10. Proceeding of Lamp The Role of the Metal Vapor Plume in Pulsed Nd : YAG Laser Welding on Aluminum 1100 H.C.Peebles;R.L.Williamson