1焊接工艺中应注意的问题。拼装前,应对管件的坡口和两边进行打磨,露出金属光泽。304L不锈钢薄壁管内外表面的沟槽应打磨润滑,打磨后沟槽两边50mm范围内不得有可见的划痕或沟槽。RT以避免误判。坡口内外20mm范围内,可用丙酮、乙醇等有机溶剂、油脂和铁锈清洗
2。不锈钢换热管刚性差,管口椭圆比较常见,衔接时容易呈现错角。装配时,用同一材料的衔接块固定工件,用克己工人装饰对、错边,使错边量在2mm以内。当焊接到焊缝的不和时,暂停,然后运用铜锤适当地锤击不和的较高一侧,以便在焊接前移除不和
3。焊接304L不锈钢换热管时,每层反面应充氩维护。在开始电弧之前,有必要对组件进行至少2分钟的吹扫,以便用氩气填充组件并完全更换管中的空气。反面充氩维护时,喷嘴两头有必要密封良好,焊缝有必要用胶带密封,开口长度不得大于周长的1/8。如果管道较长且难以充氩,可在对接焊缝中放置密封板。密封板与焊缝之间的间隔应尽或许近,不得有损坏。填料应在当地运用。氩气罐维护方法。
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