The strain measurement on the aluminum alloy welded transition joint

알루미늄 合金 異材熔接部의 變形率測定

The strain distribution on a welded aluminum alloy transition joint produced by a static tensile load has been measured using a moire method combined with photoelastic coating method. The test specimens were made of aluminum alloy 6061-T6 and 2014-T6 butt welded with ER-4043 filler metal, and were post welded heat treated (solid solution heat treatment 502.deg. C 70min.) and precipitated (artificial aging 171.deg. C 600min.) to cause an abrupt change of mechanical properties between the base metals and weld metal. The photoelastic epoxy rubber was cemented on the specimen grating which had been reproduced on the specimen surface by using an electropolishing. The measurements were compared with strains computed by Finite Element Analysis. The following results were abtained. (1) The maximum strain were distributed along the center line in the transverse directiion of the weld metal. (2) The strain gradient along the fusion line increased approaching the V-groove tip and the maximum value was observed at a quarter of width from the V-groove tip. (3) The moire method combined with photoelastic coating was proved very useful for real time strain measurement in the welded aluminum alloy transition joint.

본 연구에서는 알루미늄 합금인 알루미늄 2014와 6061의 이재를 V형 맞대기 이음을 한 후 정적인장하중을 가하여 모아레법에 광탄성 피복법을 조합한 방법에 의 해 변형율을 실시간(real time)에서 측정하고 유한요소법으로 해석한 결과와 비교검 토하였다.