扑克之星平台下载

扑克之星平台下载官网欢迎您!
全国销售
热线电话

扑克之星平台下载0577-85858287

企业邮箱:sales@bstpsteel.com

BUXIUGANGGUANDAOHANJIEQUEXIANJIDUICETANJIU

RIQI:2019-01-20

管道焊接施工中的缺陷:

裂纹是焊接中危害性最大的一种缺陷,它主要包括结晶裂纹、液化裂纹、延迟裂纹等几种形式。由于其有延伸性,在焊道存在内应力的情况下裂纹会一直延伸扩展,直至焊道被破坏。所以,在长输管道的施工中,裂纹缺陷是不允许存在的,通常也不允许返修,必须割口重焊。

  未熔合是指焊道与母材之间或焊道与焊道之间未能完全熔化结合的部分。其主要发生在管道时钟1点钟和11点钟的接头位置及管道底部6点钟仰焊位置。未熔合可分为根部未熔合、层间未熔合、坡口未熔合三种。根部未熔合主要是打底过程中焊缝金属与母材金属以及焊缝接头未熔合、层间未熔合主要是施焊过程中层与层间的焊缝金属未熔合。坡口未熔合是焊缝金属与母材坡口之间的未熔合,其中根部未熔合出现的几率较大。未熔合属于面状缺陷,易造成应力集中,危害性仅次于焊接裂纹。因此,未熔合缺陷在焊缝中是不允许存在的。

  所谓咬边就是通常所说的焊道咬肉,主要是由于在焊接过程中熔敷金属未能盖住母材的坡口,在焊道边缘留下的低于母材的缺口。浅短的咬边可以不作处理,但过深的咬边会对焊道力学性能产生严重的影响,咬边将减少母材的有效截面积,在咬边处引起应力集中,降低接头强度,特别是低合金高强钢的焊接,另外咬边的边缘组织被淬硬,易引起裂纹。这都严重影响了管道输送的安全度。

  焊接应力是由于焊后收缩受到制约造成的,制约越严重,内应力也就越大。焊接以后留下一定的残余应力是不可避免的,但是可以通过恰当的工艺措施给予一定程度的控制和调节。

  ZAIGUANDAOSHIGONGZHONG,LIEWENDECHANSHENGJIBENDOUSHIYOUYUGONGYIGUICHENGZHIXINGBUDAOWEI,WAIBUYINGLITAIDADENGQINGKUANGZAOCHENGDE。SUOYI,ZAISHIGONGZHONGYAOXUANYONGKANGLIEXINGHAODEGANGCAIZHIZUOGANGGUAN,HELIXUANZEHANJIECAILIAOJIHONGGAN,YANGEANZHAOHANJIEGONGYIPINGDINGDEYAOQIUSHIGONG,YIQUEBAOHANFENGDEZUZHIJIEGOUSUXINGHERENXING;GENJUGONGYIYAOQIUJINXINGYURE,DONGJISHIGONGSHIYINGCAIQUBAOWENCUOSHI,BIYAOSHIJINXINGRECHULIHUOHANHOUJIARE;YANGEKONGZHIZUDUIYINGLI,JINLIANGBUSHIYONGWAIDUIKOUQIJINXINGQIANGZHIZUDUI,YOUQISHIZAIGUANDAOJINXINGLIANSITOUSHI,QIEBUKECAIYONGQIANJINDING、DIAOGUANJISHANGTIWAJUEJIXIAYADENGLAIDIAOJIEDUIKOUJIANXIDEQIANGLIZUDUIFANGSHISHIGONG。

对策探究:

扑克之星平台下载GUANDAOWEIRONGHEYUFANGCUOSHIGUANDAOSHIGONGZHONG,POKOUJIAGONGYAOYANGEANGUIFANZHIXING,JIAODUBUNENGTAIXIAO,YAOBAOZHENGJIANXIKUANDU,DUNBIANBUNENGTAIHOU,CENGJIANQINGLIBUYAOGUODU,YIMIANZAOCHENGPOKOUBEIDAKUAN,XINGCHENGGOUCAODENGCAOZUOSHOUFAYAOWEN,YAOKONGZHIHAODIANLIU,BIMIANXIANNENGLIANGSHURUTAIXIAO,YUFANGGUANDAOSHIGONGZHONGWEIRONGHEXIANXIANG。

扑克之星平台下载  YAOBIANYUFANGCUOSHISHIGONGGUOCHENGZHONG,YAODIAOZHENGHAOHANJIECANSHU,BIMIANDIANLIUTAIDA、DIANHUGUOZHANG、DIANHULIBUJIZHONGERDAOZHIRONGCHIRONGFUBUDAOWEI。TONGSHI,HAIYAODIAOZHENGHANTIAOHUOHANSIDEQINGXIEJIAODU,YIFANGPIANCHUIDENGQINGKUANGDEFASHENG。CAOZUOSHOUFAYAOWEN,YUNTIAODEBAIDONGYAODAOWEI,YANGEKONGZHIYAOBIAN。

  CAIYONGYUREFA、TONGBUSHOUSUOFADENGCUOSHIKONGZHIHANJIEYINGLI。

  GUANDAOHANJIEZHONG,HANJIEWENCHAYUEDA,CANYUYINGLIYUEDA,TONGSHICONGZUZHIZHUANBIANLAISHUO,LENGQUEYUEKUAIZUZHIYINGLIYEYUEDA。YUREKEJIANXIAOWENCHAHEJIANMANLENGQUESUDU,CONGERJIANXIAOHANJIEYINGLI。TONGSHI,HANFENGDESHOUSUOSHOUDAOPANGBIANLENGJINSHUDEQIANZHIERXINGCHENGLAYINGLI,YOUXIAOQUDUANPANGBIANDEJIAOLENGDEJINSHUBUYUNXUTASHOUSUOERXINGCHENGJIAODADEYINGLI,CAIQUSHIDANGDEGONGYICUOSHI,SHINENGYUNXUTAHUOZHEBUFENYUNXUTASHOUSUO,JIUKEYIMIANCHUHUOZHEBUFENDIMIANCHUCANYUYINGLI。TONGBUSHOUSUOFAJIUSHIJIYUZHEIGEYUANLISUOCAIQUDEGONGYICUOSHI。SHIGONGZHONG,CAIYONGHELIDEHANJIECIXU,JINLIANGSHIHANFENGNENGBIJIAOZIYOUDESHOUSUO,TEBIESHINEIXIESHOUSUOBIJIAODA,CANYUYINGLIBIJIAODADEHANFENG,YEKEYISHIXIANKONGZHIHANJIEYINGLIDEMUDE。

  GUANDAOJIANSHEDUIYUQUEBAOWOGUONENGYUANSHENGMINGXIANANQUAN,WEISHEHUIJINGJIJIANSHETIGONGJIANQIANGDEBAOZHANGYOUZHONGYAOYIYI。DANGQIAN,WOGUOYOUQIGUANDAOHANJIESHIGONGFANGMIANRENGYOUXUDUOBUZU,扑克之星平台下载 ZHIYOUZAISHIJIANZHONGBUDUANTANSUOXINDECUOSHI,JIAQIANGGUANDAOHANJIEJISHUCHUANGXIN,CAINENGQUEBAONENGYUANSHENGMINGXIANDEANQUAN,WEIWOGUODEXIANDAIHUAJIANSHETIGONGNENGYUANBAOZHANG。