前言锅炉联箱是锅炉的加热器、蒸发器和过热器的分配和集合管箱,公称直径100 A～250A(φ114.3～267.4mm),公称厚度Sch80～160(约10～30mm),超过该尺寸的厚壁管用作母管。如图1和图2所示,在母管上垂直地排列着许多管接头,是φ30～50mm的管子按80～200mm的紧密间距进行焊接的。焊 Foreword Boiler header is the boiler heater, evaporator and superheater distribution and collection of pipe boxes, the nominal diameter of 100 A ~ 250A (φ114.3 ~ 267.4mm), the nominal thickness of Sch80 ~ 160 (about 10 ~ 30mm), more than Thick-walled tubes of this size are used as female tubes. As shown in Fig. 1 and Fig. 2, a large number of pipe joints are vertically arranged on a mother pipe, and pipes of φ30 to 50 mm are welded at a tight pitch of 80 to 200 mm. weld