求翻译：钢管与封板、锥头组成杆件时，两端对接焊缝为全熔透焊缝，钢管端部均应开30°坡口，并应根据设计要求选用相应的焊条施焊，为了使焊缝根部焊透，组装固定焊点和第一皮焊缝所用焊条直径应是什么意思？

Steel pipe and seal plate, cone head form rods, the ends of full-penetration butt weld seam, open pipe ends shall be 30 ° bevel, and should be selected according to the design requirements of the appropriate welding electrodes, welding in order to seam root penetration, assembly fixed joints and the

Steel pipe and cover plate, phase composition and rods, when both ends to the melting of the welds and steel pipe ends of Welds shall be opened, 30 degrees slope design requirements, and should be chosen in accordance with corresponding welding electrode welding, in order to make the roots of welds,

When steel pipe and closing board, cone headed composition member, the both sides butt welding seam for all melts thoroughly the welded joint, the steel pipe nose should open 30° the bevel, and should select correspondingly a

Steel pipe and seal plate, and cone head composition rod pieces Shi, ends butt weld for full melt through weld, steel pipe end Department are should open 30 ° slope mouth, and should under design requirements selection corresponding of electrode effects welding, to makes weld roots welding through,