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我厂生产的300吨摩擦压力机上有两根直径195公厘的支持螺栓。由于这种零件的长度很长(2825公厘),我們就用直径200公厘的30号鋼和45号钢的毛坯,采用板极电渣焊对接。从化学成份来看,30号鋼和45号钢的含碳量都在0.3～0.5％;由于碳的含量比較高,采用一般对接工艺,焊縫容易产生热裂。但是采用电渣焊时,在焊接过程中,大軸的边緣预先經过渣池的預热和慢慢的冷却,因此与熔剂层下自动焊和手工电孤焊相比較,焊縫中之含碳量是允許比較高的。 圓形断面电渣焊接的准备工作是比較簡便的,不象电渣焊接环形焊縫和其他断
The 300 ton friction press produced by our factory has two support bolts with a diameter of 195 mm. Because of the long length of this part (2825 mm), we use a 200 mm diameter steel for 30 and 45 steel with butt welding. From the chemical composition point of view, 30 steel and 45 steel carbon content of 0.3 to 0.5%; due to the relatively high carbon content, the use of the general docking process, the weld is prone to thermal cracking. However, when using electroslag welding, in the welding process, the edge of the large shaft is preheated and slowly cooled by the slag pool in advance, and therefore compared with the automatic flux and manual arc welding under the flux layer, The carbon content is allowed to be higher. Preparation of circular cross-section of electroslag welding is relatively simple, unlike the electroslag welding ring weld and other broken