grip end/bare portion有区别吗(关于焊条)? The grip end of each electrode shall be bare (free of covering) for a distance of not less than 19 mm, nor more than 32 mm, to provide for electrical contact with the holder. The arc end of each electrode shall be sufficiently bare and the covering sufficiently tapered to permit easy striking of the arc. The length of the bare portion (measured from the end to the full cross section of the covering is obtained) shall not exceed 3 mm or the diameter of the core wire, whichever is less. Electrodes with chipped coverings near the arc end, baring the core wire no more than the lesser of 6 mm or twice the diameter of the core wire meet the requirements of this specification, provided no chip uncovers more than 50 [wiki]%[/wiki] of the circumference of the core. (重点是标红句的理解)。 [ ]查看更多8个回答 . 5人已关注