熔著金属试片

[机] all-weld metal test specimen

róng zhe jīn shǔ shì piàn ㄖㄨㄥˊ ㄓㄜ˙ ㄐㄧㄣ ㄕㄨˇ ㄕˋ ㄆㄧㄢˋ