为了在焊接接头始端和末端获得正常尺寸的焊缝截面，和焊条电弧焊一样在直的接缝始、末端焊前装配一块金属板，开始焊接用的板称引弧板，结束焊接用的板称引出板，用后再把它们割掉。 通常始焊和终焊处最易产生焊接缺陷，诸如焊瘤、弧坑等，使用引弧板和引出板就是把焊缝两端向外延长，避免这些缺陷落在接头的始末端，从而保证了整条焊缝质量稳定均匀。
本文从基础板弯曲损伤概念出发引出弯曲损伤变量。
In this paper according to the concept of bending damage of baseplate, the bending damage variable is defined.
双室式出线盒，特设超厚出线盒板护板，引出电缆防扭设置。
Two chamber type outlet box with particular extra-thick outlet box fender and anti-twist setting for outlet cables.
特点： 无感式结构与良好的自愈特性，绝缘电阻高，容量稳定性好，引出线适宜于印刷电路板插装。
Features: Non-inductive construction and excellent self-healing property. High insulation resistance and stability of capacitance. Leads are suitable for inserting in printed circuit board.
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