二氧化碳液態低溫容器槽車是由外容器和內容器組成。內容器材質為06Cr18Ni11Ti不銹鋼，壁厚16mm。內容器外形尺寸：直徑1600mm，長為5786mm，容積為11m3。除進行外觀目視檢查外，還必須對焊縫進行100％的滲透檢測和100％的射線檢測。內容器還要進行2.88MPa干燥無油壓縮空氣試驗和氦質譜真空檢漏，漏氣率不大于2×10-5Pa·L／s。
焊接工藝：所有縱焊縫(feng)和環焊縫(feng)（除一端頭與筒體環焊縫(feng)外）均采用(yong)埋弧(hu)焊，焊機(ji)型號為MZ-1000型，采用(yong)直流反極性(xing)電源。焊絲牌號H08Cr19Ni10Ti，直徑為4mm，焊劑為HJ260。
1. 縱(zong)縫埋(mai)弧焊(han)
鋼板放在刨邊機上按圖3-72進(jin)(jin)(jin)行(xing)坡口(kou)加工，待焊(han)(han)(han)鋼板放在門(men)式焊(han)(han)(han)接夾具（圖3-19）上進(jin)(jin)(jin)行(xing)裝配，待焊(han)(han)(han)處(chu)清(qing)除油污后(hou)進(jin)(jin)(jin)行(xing)焊(han)(han)(han)接，焊(han)(han)(han)接參(can)數見表(biao)3-62，焊(han)(han)(han)好(hao)第(di)1、2層焊(han)(han)(han)縫后(hou)要進(jin)(jin)(jin)行(xing)清(qing)根(gen)，先用(yong)碳弧(hu)氣刨，然(ran)后(hou)用(yong)風動砂輪清(qing)理打磨出金屬光澤，并(bing)保證清(qing)根(gen)后(hou)凹槽尺寸均勻一(yi)致，然(ran)后(hou)焊(han)(han)(han)接第(di)3層焊(han)(han)(han)縫。
2. 環縫埋弧焊
環(huan)(huan)縫(feng)(feng)(feng)埋弧(hu)焊(han)(han)(han)(han)接(jie)(jie)包括筒(tong)節(jie)與(yu)筒(tong)節(jie)和筒(tong)節(jie)與(yu)一端頭的環(huan)(huan)縫(feng)(feng)(feng)焊(han)(han)(han)(han)接(jie)(jie)。將焊(han)(han)(han)(han)好的筒(tong)節(jie)、封頭放在焊(han)(han)(han)(han)接(jie)(jie)滾輪架（見圖3-18）上進(jin)行(xing)裝配，用(yong)焊(han)(han)(han)(han)條電弧(hu)焊(han)(han)(han)(han)進(jin)行(xing)定位焊(han)(han)(han)(han)，在平臺式(shi)焊(han)(han)(han)(han)接(jie)(jie)操作機上（如圖3-19）進(jin)行(xing)環(huan)(huan)縫(feng)(feng)(feng)焊(han)(han)(han)(han)接(jie)(jie)，先焊(han)(han)(han)(han)內焊(han)(han)(han)(han)縫(feng)(feng)(feng)（第1、2層(ceng)）然后按(an)縱縫(feng)(feng)(feng)工藝進(jin)行(xing)清根再焊(han)(han)(han)(han)第3層(ceng)焊(han)(han)(han)(han)縫(feng)(feng)(feng)，焊(han)(han)(han)(han)接(jie)(jie)參數可參表(biao)3-62。
上述(shu)縱、環縫(feng)焊接完畢，先進(jin)行(xing)(xing)目視檢查，然(ran)后(hou)進(jin)行(xing)(xing)100％滲透檢測，排除焊縫(feng)表面(mian)缺陷后(hou)，再進(jin)行(xing)(xing)100％射線(xian)檢測，焊縫(feng)內部質量應達到設計(ji)圖樣要求后(hou)才能進(jin)行(xing)(xing)下(xia)面(mian)工序(xu)。
3. 另(ling)一(yi)封(feng)頭與筒(tong)體(ti)焊接
內容器(qi)(qi)是(shi)(shi)一個密封容器(qi)(qi)（除輸(shu)入(ru)、輸(shu)出液管路外），沒有(you)人(ren)孔裝置，焊(han)(han)(han)(han)接(jie)設備和人(ren)員無(wu)法進(jin)(jin)入(ru)容器(qi)(qi)內操作。采(cai)用(yong)的焊(han)(han)(han)(han)接(jie)工(gong)藝如圖3-73所示(shi)。內環(huan)縫(feng)增加了(le)一個環(huan)形(xing)墊(dian)圈(quan)，材質(zhi)與內容器(qi)(qi)材質(zhi)相同，墊(dian)圈(quan)厚度(du)為4mm，寬度(du)為30mm。先用(yong)鎢極氬弧焊(han)(han)(han)(han)進(jin)(jin)行(xing)打底焊(han)(han)(han)(han)，保證焊(han)(han)(han)(han)透(tou)實現(xian)單(dan)面焊(han)(han)(han)(han)雙面成形(xing)，通過100％射線檢(jian)測判片合格后(hou)(hou)，進(jin)(jin)行(xing)第2層(ceng)焊(han)(han)(han)(han)條(tiao)電弧焊(han)(han)(han)(han)，其目的是(shi)(shi)提(ti)高焊(han)(han)(han)(han)縫(feng)厚度(du)，防止埋弧焊(han)(han)(han)(han)時由(you)于熔(rong)深過大(da)而將打底焊(han)(han)(han)(han)焊(han)(han)(han)(han)縫(feng)焊(han)(han)(han)(han)穿。第3層(ceng)環(huan)形(xing)焊(han)(han)(han)(han)縫(feng)用(yong)埋弧焊(han)(han)(han)(han)完成。各層(ceng)焊(han)(han)(han)(han)縫(feng)的焊(han)(han)(han)(han)接(jie)參數見表(biao)3-63。焊(han)(han)(han)(han)后(hou)(hou)將環(huan)焊(han)(han)(han)(han)縫(feng)進(jin)(jin)行(xing)滲透(tou)檢(jian)測和射線檢(jian)測合格后(hou)(hou)再進(jin)(jin)行(xing)無(wu)油干燥氣壓試驗和氮質(zhi)譜真空檢(jian)漏(lou)。全部滿(man)足(zu)圖樣技術性(xing)能要求后(hou)(hou)才能與外容器(qi)(qi)進(jin)(jin)行(xing)組(zu)裝。
