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福州镀锌钢管的焊接特点及焊接工艺

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福州镀锌钢管的焊接特点及焊接工艺

发布日期:2017-09-28 作者:福州镀锌钢管 点击:

DUXINGANGGUANGFANYUNYONGYUGEXINGGEYE,CAIYONGDUXINGANGDEHAOCHUSHILIYONGZAIKONGQIZHONGNENGGOUXINGCHENGZHIMIYANGHUAWUBAOHUCENGDEJINSHUXINLAIBAOHUNEIBUDEGANGJIEGOU。ZAIBEIHANJIE、HUASHANGDEQINGKUANGXIA,YOUYUZn-FeYUANDIANCHIDECUNZAI,XIANGDUIHUOPODEDUXINBUFENKEYIZUOWEIXISHENGYANGJI,YANHUANGANGTIEDEXIUSHI,NAIFUSHIXINGLIANGHAO。RANERYOUYUDUXINCENGDECUNZAI,ZAIHANJIEZHONGRONGYICHANSHENGLIEWEN、QIKONG、JIAZHA,JIAONANDEDAOLIANGHAODEHANJIEZHILIANG。 

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臵。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”。同时,锌与铁可形成金属间脆性化合物,如Fe3Zn10、FeZn10等。这些脆性相使焊缝金属塑性降低,在拉应力作用下而产生裂纹。如果焊接角焊缝,尤其是T形接头的角焊缝最容易产生穿透裂纹。镀锌钢焊接时,坡口表面及边缘处的锌层,在电弧热作用下,产生氧化、熔化、蒸发以至挥发出白色烟尘和蒸汽,极易引起焊缝气孔。由于氧化而形成的ZnO,其熔点较高,约1800°C以上,若在焊接过程中参数偏小,将引起ZnO夹渣,同时由于Zn成为脱氧剂产生FeO-MnO或FeO-MnO-SiO2低熔点氧化物夹渣。

福州镀锌钢管

 如果选择焊接规范不合适,操作手法不当,很容易使焊缝边缘处的镀锌层熔化以至扩大熔化区域,有可能破坏镀锌层,尤其是在拉长电弧和大幅度摆动操作情况下,增宽熔化区域,破坏镀锌层更为严重。 同时,由于锌的蒸发,挥发出大量的白色烟尘,对人体有刺激、伤害作用,因此,选择产生烟尘量较低的焊接方法、材料也是必须考虑的因素。 

DUXINGANGDEHANJIEFANGFAJIAODUO,YIBANZAIDUXINGANGJIEGOUZHONGCHANGYONGQIHAN、SHOUGONGDIANHUHAN、CO2QITIBAOHUHAN、MAIHUZIDONGHAN、WUJIYAHUHANDENGFANGFA。 

QIHANGUOQUCHANGYONGYUDUXINGUANDEHANJIE,YOUYUQIHANRESHURUBUJIZHONG,RONGYICHANSHENGQUEXIAN,HANFENGJIXIEXINGNENGCHADENGQUEDIAN,MUQIANZAIANZHUANGXINGYEJIBENTAOTAI。QIHANDUIDUXINCENGPOHUAIJIAODA。 

 CO2气体保护焊对镀锌钢的焊接性能良好,当采用合适的焊接规范和匹配的保护气体、焊接材料时,可获得优质的焊接接头。该方法在工程实践中较少采用。  

WUJIYAHUHANDIANHUNENGLIANGJIZHONG,DUIDUXINCENGDEPOHUAIJIAOSHAO,BINGQIEJIAOYIXINGCHENGLIANGHAODEDANMIANHANSHUANGMIANCHENGXINGJIETOU,SHIZHIDECAIYONGDEYIZHONGHANJIEFANGFA,DANHANJIESUDU、JIAOMAN、CHENGBENJIAOGUI。 

SHOUGONGDIANHUHANSHIMUQIANGUANDAOANZHUANGZHONGCAIYONGZUIWEIPUBIANDEYIZHONGHANJIEFANGFA。ZAIZHENGQUEXUANZEHANTIAOQINGKUANGXIA,RUJ421、J422、J423DENGYANGHUATAIXINGHETAIGAIXINGHANTIAOSHIHANSHI,YOUYUZHEIXIEHANTIAOYAOPIZHONGHANYOUDALIANGDEJINHONGSHIHETAITIEKUANG,HANTIAODERONGHUALVJIAODA,XIANGDUIZENGJIALERONGHUASUDU。RUGUOZAIBUBAIDONGTIAOJIANXIA,ZHISHINENGPOHUAIRONGCHIQIANYANDENGDUXINCENG,YIBANBUZHIYUKUODARONGHUAQUYU,KEJIANSHAOXINYETIDUIHANFENGJINSHUDESHENTOU;ZAICAIYONGZHENGQUEDECAOZUOFANGFAHEHANJIECAILIAODEQINGKUANGXIA,KEDEDAOJIETOUJIXIEXINGNENGJIAOHAO,BINGWUQUEXIANDEHANJIEZHILIANG。YOUYUSHOUGONGDIANHUHANXIANGDUIYUWUJIYAHUHANJIAGEBIANYI、SUDUKUAI,ZAIJUBEICAOZUOSHULIANDEHANGONGQINGKUANGXIA,CAIYONGSHOUGONGDIANHUHANGONGYI。  

DUXINGANGDEHANQIANZHUNBEIYUYIBANDEDITANGANGSHIXIANGTONGDE,XUYAOZHUYIDESHIYAORENZHENCHULIHAOPOKOUCHICUNHEFUJINDEDUXINCENG。WEILEHANTOU,POKOUCHICUNYAOSHIDANG,YIBAN60~65°,YAOLIUYOUYIDINGDEJIANXI,YIBANWEI1.5~2.5mm;WEILEJIANSHAOXINDUIHANFENGDESHENTOU,ZAIHANZHIQIAN,KEJIANGPOKOUNEIDEDUXINCENGQINGCHUYIHOUZAIHAN。ZAISHIJIGONGZUOZHONG,CAIYONGLEJIZHONGDAPOKOU,BULIUDUNBIANGONGYIJINXINGJIZHONGKONGZHI,LIANGCENGHANJIEGONGYI,JIANSHAOLEWEIHANTOUDEKENENGXING。

 焊条应根据镀锌管的基体材质选用,一般低碳钢由于考虑易操作性,选用J422较为普遍。  焊接手法:在焊多层焊的第一层焊缝时,尽量使锌层熔化并使之汽化、蒸发而逸出焊缝,可大大减少液体锌留在焊缝中。在焊角焊缝时,同样在第一层尽量使锌层熔化并使之汽化、蒸发而逸出焊缝,其方法是先将焊条端部向前移出约5~7mm左右,当使锌层熔化后再回到原来位臵继续向前施焊。焊接完毕后要及时清理焊缝,并刷涂富锌底漆,做好防腐措施。 


相关标签:福州镀锌钢管
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