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湖南镀锌管焊接注意事项

湖南镀锌管焊接前焊缝处必须打磨,必须把焊接处的镀锌层打磨掉,否则会产生气泡、沙眼、假焊等。还会使焊缝变脆,刚性下降。

 

镀锌钢焊接特点分析
      镀锌钢一般是在低碳钢外镀一层锌,镀锌层一般在20um厚。锌的熔点在419°C,沸点908°C左右。在焊接中,锌熔化成液体浮在熔池表面或在焊缝根部位置。锌在铁中具有较大固溶度,锌液体会沿晶界深入浸蚀焊缝金属,低熔点锌形成“液体金属脆化”。

 

      TONGSHI,XINYUTIEKEXINGCHENGJINSHUJIANCUIXINGHUAHEWU,ZHEIXIECUIXINGXIANGSHIHANFENGJINSHUSUXINGJIANGDI,ZAILAYINGLIZUOYONGXIAERCHANSHENGLIEWEN。

 

      RUGUOHANJIEJIAOHANFENG,YOUQISHITXINGJIETOUDEJIAOHANFENGZUIRONGYICHANSHENGCHUANTOULIEWEN。DUXINGANGHANJIESHI,POKOUBIAOMIANJIBIANYUANCHUDEXINCENG,ZAIDIANHUREZUOYONGXIA,CHANSHENGYANGHUA、RONGHUA、ZHENGFAYIZHIHUIFACHUBAISEYANCHENHEZHENGQI,JIYIYINQIHANFENGQIKONG。

 

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如何控制镀锌钢焊接工艺?
      镀锌钢的焊前准备与一般的低碳钢是相同的,需要注意的是要认真处理好坡口尺寸和附近的镀锌层。为了焊透,坡口尺寸要适当,一般60~65°,要留有一定的间隙,一般为1.5~2.5mm;为了减少锌对焊缝的渗透,在焊之前,可将坡口内的镀锌层清除以后再焊。

 

      ZAISHIJIJIANLIGONGZUOZHONG,CAIYONGLEJIZHONGDAPOKOU,BULIUDUNBIANGONGYIJINXINGJIZHONGKONGZHI,LIANGCENGHANJIEGONGYI,JIANSHAOLEWEIHANTOUDEKENENGXING。

 

      HANTIAOYINGGENJUDUXINGUANDEJITICAIZHIXUANYONG,YIBANDITANGANGYOUYUKAOLVYICAOZUOXING,XUANYONGJ422JIAOWEIPUBIAN。

 

      HANJIESHOUFA:ZAIHANDUOCENGHANDEDIYICENGHANFENGSHI,JINLIANGSHIXINCENGRONGHUABINGSHIZHIQIHUA、ZHENGFAERYICHUHANFENG,KEDADAJIANSHAOYETIXINLIUZAIHANFENGZHONG。

 

      ZAIHANJIAOHANFENGSHI,TONGYANGZAIDIYICENGJINLIANGSHIXINCENGRONGHUABINGSHIZHIQIHUA、ZHENGFAERYICHUHANFENG,QIFANGFASHIXIANJIANGHANTIAODUANBUXIANGQIANYICHUYUE5~7mmZUOYOU,DANGSHIXINCENGRONGHUAHOUZAIHUIDAOYUANLAIWEIZHIJIXUXIANGQIANSHIHAN。

 

      ZAIHENGHANHELIHANSHI,RUXUANYONGDUANZHAHANTIAORUJ427,YAOBIANQINGXIANGHUIHENXIAO;RUGUOCAIYONGQIANHOUWANGFANYUNTIAOJISHU,GENGKEYIDEDAOWUQUEXIANDEHANJIEZHILIANG。