鎢極氬弧焊接不銹鋼管設(she)備主要(yao)有(you)以(yi)下(xia)幾種(zhong)

①. 鎢極氬(ya)弧焊(han)機

   鎢(wu)(wu)極氬(ya)弧(hu)焊(han)(han)(han)(han)(han)的(de)電(dian)(dian)源必須具有陡降或垂直陡降外特性，國(guo)內幾(ji)種(zhong)專(zhuan)(zhuan)用的(de)鎢(wu)(wu)極氬(ya)弧(hu)焊(han)(han)(han)(han)(han)機的(de)型號見表4-25。此外，焊(han)(han)(han)(han)(han)接非重要件，可用焊(han)(han)(han)(han)(han)條電(dian)(dian)弧(hu)焊(han)(han)(han)(han)(han)的(de)弧(hu)焊(han)(han)(han)(han)(han)發電(dian)(dian)機或弧(hu)焊(han)(han)(han)(han)(han)整流器(qi)作弧(hu)焊(han)(han)(han)(han)(han)電(dian)(dian)源，配以(yi)專(zhuan)(zhuan)用焊(han)(han)(han)(han)(han)槍，也可實現(xian)手工鎢(wu)(wu)極氬(ya)弧(hu)焊(han)(han)(han)(han)(han)。

   專用焊(han)機(ji)應具(ju)有下(xia)(xia)列功能(neng)：焊(han)前提前1.5～4.0s輸(shu)(shu)送保(bao)護(hu)氣(qi)(qi)(qi)體，以驅趕輸(shu)(shu)氣(qi)(qi)(qi)管內(nei)和焊(han)接(jie)(jie)(jie)區(qu)間的空氣(qi)(qi)(qi)，防(fang)(fang)止(zhi)(zhi)產(chan)生(sheng)氣(qi)(qi)(qi)孔；焊(han)后延遲5～15s停止(zhi)(zhi)輸(shu)(shu)送保(bao)護(hu)氣(qi)(qi)(qi)體，以保(bao)證尚未冷(leng)卻(que)的鎢極和熔池能(neng)在保(bao)護(hu)氣(qi)(qi)(qi)氛下(xia)(xia)冷(leng)卻(que)，防(fang)(fang)止(zhi)(zhi)氧化和產(chan)生(sheng)氣(qi)(qi)(qi)孔；自動接(jie)(jie)(jie)通和切斷保(bao)護(hu)氣(qi)(qi)(qi)源及(ji)引弧(hu)、穩(wen)弧(hu)的電路，防(fang)(fang)止(zhi)(zhi)接(jie)(jie)(jie)觸(chu)引弧(hu)燒損(sun)鎢極和接(jie)(jie)(jie)頭產(chan)生(sheng)夾鎢缺陷；控制電源的通斷；焊(han)接(jie)(jie)(jie)結束(shu)前電流(liu)能(neng)自動衰減，以消除(chu)弧(hu)坑和防(fang)(fang)止(zhi)(zhi)弧(hu)坑開(kai)裂。

②. 鎢極氬弧焊焊槍（arc welding gun）

   鎢極氬(ya)弧焊(han)(han)焊(han)(han)槍由噴嘴、鎢極夾持裝(zhuang)置、導線、氣水輸送(song)膠管、啟動開關等(deng)零部(bu)件(jian)組(zu)成（結構詳見圖4-31）。根(gen)據(ju)適(shi)用的焊(han)(han)接電流大(da)小，焊(han)(han)槍分水冷(leng)式和氣冷(leng)式兩類。常用水冷(leng)卻式焊(han)(han)槍型(xing)號有QS-75°／400A、QS-75／500A等(deng)，可匹(pi)配在大(da)功(gong)率(lv)氬(ya)弧焊(han)(han)機上；氣冷(leng)卻式的焊(han)(han)槍型(xing)號有QQ-85／100A、QQ-85／200A等(deng)·可匹(pi)配在小功(gong)率(lv)氬(ya)弧焊(han)(han)機上。

③. 氣體保護裝置

   氣(qi)體(ti)保護裝置(zhi)(zhi)有氬(ya)氣(qi)瓶(ping)(ping)、減壓(ya)(ya)(ya)器(qi)和流(liu)量(liang)(liang)(liang)計。氬(ya)氣(qi)瓶(ping)(ping)是儲存氬(ya)氣(qi)的(de)(de)(de)壓(ya)(ya)(ya)力容器(qi)，使用(yong)(yong)(yong)(yong)時應注意安全規(gui)則。按 GB 7144-1999《氣(qi)瓶(ping)(ping)顏色(se)標志》的(de)(de)(de)規(gui)定，氬(ya)氣(qi)瓶(ping)(ping)應為銀灰色(se)，并標有“氬(ya)”（字的(de)(de)(de)顏色(se)為深綠色(se)）字樣。使用(yong)(yong)(yong)(yong)中(zhong)應注意瓶(ping)(ping)內氬(ya)氣(qi)不得用(yong)(yong)(yong)(yong)盡，應保留0.5MPa的(de)(de)(de)余氣(qi)，以防止空氣(qi)混入而造成(cheng)氬(ya)氣(qi)不純。減壓(ya)(ya)(ya)器(qi)可用(yong)(yong)(yong)(yong)普通(tong)氧氣(qi)減壓(ya)(ya)(ya)器(qi)QD-3A 和QD-2A代用(yong)(yong)(yong)(yong)。流(liu)量(liang)(liang)(liang)計是標定通(tong)入氣(qi)體(ti)流(liu)量(liang)(liang)(liang)的(de)(de)(de)裝置(zhi)(zhi)，保證氬(ya)氣(qi)在焊接過程中(zhong)按給定的(de)(de)(de)數量(liang)(liang)(liang)輸送(song)。常用(yong)(yong)(yong)(yong)的(de)(de)(de)有LZB型玻璃(li)轉子流(liu)量(liang)(liang)(liang)計或醫用(yong)(yong)(yong)(yong)流(liu)量(liang)(liang)(liang)計均可。但應注意流(liu)量(liang)(liang)(liang)計的(de)(de)(de)示值受氣(qi)體(ti)密度的(de)(de)(de)影響。使用(yong)(yong)(yong)(yong)非氬(ya)氣(qi)專用(yong)(yong)(yong)(yong)流(liu)量(liang)(liang)(liang)計時，表中(zhong)的(de)(de)(de)示值并非氬(ya)氣(qi)的(de)(de)(de)真實流(liu)量(liang)(liang)(liang)。現在已有氬(ya)氣(qi)減壓(ya)(ya)(ya)器(qi)和流(liu)量(liang)(liang)(liang)計結合一體(ti)的(de)(de)(de)儀器(qi)，如YQAR-195，以及CO2減壓(ya)(ya)(ya)器(qi)和流(liu)量(liang)(liang)(liang)計一體(ti)的(de)(de)(de)YQT-195。