40%.45%.50%.55%银焊条银焊丝银焊环
耐磨药芯焊丝YD256/YD..
40%.45%.50%.55..
20%.25%.30%.35..
YD212耐磨焊丝气保药芯高..
HT-103.HT-105镍..
Ni317.327.337...