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      關于LNG車載瓶、杜瓦罐自動焊接工藝分析
      發布者:admin  發布時間:2013/11/6 14:06:48  點擊:7719
            LNG車載瓶、杜瓦罐等低溫焊接鋼瓶材質為304不銹鋼,內膽采蓮厚度為2.5~8mmm,外筒材料厚度為2.5~4mm。
            內膽縱縫和環縫一定要焊透,焊縫質量要通過X光攝片,焊縫加高余量1~2.5mmm。
            外筒縱縫和環縫只要基本焊透,焊縫不需要X光攝片,但要求焊縫平整,焊縫加高余量0~1.5mm。外筒的焊接縫尤其需要美觀、漂亮,為整體鋼瓶爭光。
            根據以上的質量要求和我公司06年就開始為“查特”等公司提供焊接工藝和裝備的實踐經驗,認為:內膽縱縫和環縫均采用MIG焊工藝為好。MIG焊電流密度大,引成熔滴射流過渡,電弧穿透特性特強。5mm一下的304不銹鋼板可以不開坡口一次焊透,6~8mm的板開坡口亦可一次焊透,單面焊雙面成型,X光攝片通過沒有問題。焊速很快,一分鐘焊1000mm左右。MIG焊的這種優異的焊接特性是等離子弧焊和氬弧焊所不能比擬的;也是2006年“查特”公司要我們“不要宣傳、要保密”的主要原因之一。
            但是MIG焊也有它的不足:如焊速雖快,但焊縫成形不夠漂亮,焊縫高度不易控制,往往偏高,所以MIG焊用在外筒的縱縫、環縫上就不堪理想了。
            我們建議:外筒的縱縫和環縫都采用TIG焊接工藝,內筒的縱縫和環縫都采用MIG焊接工藝。
      TIG焊有它突出的優點,焊縫光潔、漂亮,4mm一下的板材不開坡口可以一次焊透成形,焊縫余高極易控制,寬度、高度一致,脈沖TIG焊尤為漂亮。
            外筒厚度2.5~4mm的不銹鋼板材,TIG焊速比等離子焊還快,每分鐘焊500mm~350mm左右。但是設備投資比PAW低很多,操作容易掌控。是外筒縱縫和環縫焊接的選擇。
      TIG的焊速比MIG焊慢一倍左右,但拋光極易。MIG焊用在外筒的焊接上,焊縫是不夠美觀的,MIG焊縫用在拋光、打磨上話費的時間太多了。
           關于等離子焊:等離子焊的優點是電弧穿透性好,小孔效應使板厚8mm一下的304板可以不開坡口,一次焊透,是它非常突出的優點,用在快易冷迷你罐、儲罐等板材較厚的場合是非常合適的。用在LNG車載瓶杜瓦罐外筒等壁厚較薄的場合不能充分發揮出它的優異性。PAW設備投資高,工藝復雜,不易掌控是它的弱點。
      內筒的縱縫、環縫都采用MIG焊,外筒的縱縫、環縫都采用TIG焊,我們已經為查特深冷工程系統有限公司、江蘇秋林重工股份有限公司、常州藍翼飛機裝備制造有限公司、佛山市華來普氣體設備有限公司、浙江普陽深冷裝備有限公司、河北藝能鍋爐有限責任公司、石家莊安瑞科氣體機械有限公司等提供了以上的焊接工藝和裝備。上述用戶經過幾年的使用經驗,都取得了相當滿意的結果。
            杜瓦罐的外筒內壁需要銅管與不銹鋼板可靠的釬焊,本公司設計制作的銅管自動釬焊設備是杜瓦罐、快易冷等低溫鋼瓶焊接必不可少的設備,受到了查特、圣達因、秋林重工、華萊普、藝能鍋爐、常州博朗等用戶的一致好評。

      無錫奇能焊接系統有限公司        袁寶興

      AUTO. WELDING TECHNOLOGY ANALYSIS ABOUT LNG VEHICLE-MOUNTED CYLINDER AND DURA-CYL

            Material of ING Vohiclo-mountod cylindor and Dura-Cyl is 304 stainless stool .Thicknoss of innor cylindor is 2.5-8mm while thickness of outer cylindor is 2.5-4mm.
            Longitudinal welding and circumforontial welding of inner cylinder must be full-penetration welded .welding quality should be checked with X Ray Radiography Welding heightening allowance is 1-2.5mm.
      Longitudinal welding and circumforontial welding of outor cylinder should be almost full-penetration welded, no need X Ray Radiography. Welding should be smooth, welding heightening allowance is 0~1.5mm .Welding of outer cylinder must be beautiful.
            With above mentioned quality roquiroments. we Wuxi Qineng Welding System supplied welding technology and equipment to international Co. such as CHART since year of 2006. In our opinion, both longitudinal welding and circumferential welding of inner cylinder should adopt MIG welding technology .MIG welding is with high density current which loads to droplet streaming transfer ,so ponotrability of electric arc is super strong. with so strong penetrabllity, 304 stainless steel less than 5mm without opening groove could be full- penetration welded by ono time. Even for 8 -8mm plate with groove could be full-penetration welded .one side welding with double-side forming, no problem with X-Ray Radiography .Also MIG welding is with high welding speed, 1000mm per minute These excellent welding performances are incomparable with that of PAW and argon arc welding. This is also the main reason why Chart Co. required us "No Publicity. Keep Secret".
            MIG welding also has its disadvantages. such as welding shape is not excellent though welding speed is high, welding height is not so easily controlled that it is usually over-height. In this case. MIG welding is not quiet ideal for longitudinal and circumferential welding of outer cylinder.
            We suggest for outer cylinder both longitudinal and circumferential adopt TIG welding technology while for inner cylinder MIG welding.
            TIG welding has highlight advantages, such as smooth woelding, one-time full-penetration welding for plate below 4mm without groove, easily controlled welding height, accordant width and height, Esp. for pulse TIG welding.
            TIG welding speed is even faster than PAW of outor cylinder with 2.5-4mm stainless steel. About 350-500mm por minute. Investment of TIG welding equipments is much lower than that of PAW. also TIG welding is easily operated .Best choice for longitudinAl and circumferential welding of outer cylinder.
            TIG welding speed is nearly one-timo lower than that of MIG. But welding is easily polished For MIG welding, welding is not beautiful and it takes too much time to be polished.
            About PAW. it has advantages of good penetrability. With keyhole effects.304 plate below 8mm without groove could be one-time full-penetration welded. PAW is quiet suitable for welding cryoEASE, storage tank etc which has high thickness. But it could not show its advantages in welding LNG vehicle-mounted cylinder. Dura-cyl which needs lower thickness plate. High investment, complicated technology and not easy operating are all the weakness of PAW.
            Both longitudinal and circumforontial welding of inner cylinder adopt MIG welding while both longitudinal and circuferential welding of outer cylinder adopt TIG welding this is what welding technology and equipment we supplied to foltowing co. s. After several years of use.all of these co.s achieved quiet sati sfactory results. These co,s are Chart Cryogenic Engineering Systems Co.,Ltd., Jiangsu Qiulin Heave Industry. Changzhou Lanyi Aircraft Equipmont Manufacture Limited Company. Foshan Huato Gas Co.,Ltd.,Zhejiang Puyang Cryogenic Equipment Co.,Ltd.,Hebei Yineng Boiler Co., Ltd.,Shijiazhuang Enrlc Gas Equipment Co., Ltd etc.
            Inner wall of Dura-cyl outer cylinder needs reliable brazing welding between copper tube and stainless steel sheet,Auto. Copper tube brazing soldering equipment designed by us is the absolutely necessary machine for welding Dura-cyl, cryoEASE.This machine is highly commended by our customers such as Chart. Sanctum. Qiulin Heavy Industry. Huate Gas. Yineng Boiler.Changzhou Buran.

      Wuxi Qineng Welding System Co., Ltd.      BaoxingnYuan

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