鎢極氬弧焊接不銹鋼管設(she)備主要有(you)以下幾種
①. 鎢(wu)極氬弧(hu)焊(han)機
鎢極氬弧(hu)(hu)(hu)焊(han)(han)的(de)電(dian)源必(bi)須具有陡(dou)(dou)降(jiang)或垂直陡(dou)(dou)降(jiang)外(wai)特性，國(guo)內幾(ji)種專(zhuan)用(yong)(yong)的(de)鎢極氬弧(hu)(hu)(hu)焊(han)(han)機(ji)的(de)型號見表4-25。此(ci)外(wai)，焊(han)(han)接非重要件，可用(yong)(yong)焊(han)(han)條電(dian)弧(hu)(hu)(hu)焊(han)(han)的(de)弧(hu)(hu)(hu)焊(han)(han)發電(dian)機(ji)或弧(hu)(hu)(hu)焊(han)(han)整(zheng)流器作弧(hu)(hu)(hu)焊(han)(han)電(dian)源，配以專(zhuan)用(yong)(yong)焊(han)(han)槍，也(ye)可實(shi)現(xian)手工鎢極氬弧(hu)(hu)(hu)焊(han)(han)。
專用焊(han)機應具有下列功能(neng)：焊(han)前(qian)提前(qian)1.5～4.0s輸(shu)送保護氣體，以驅趕輸(shu)氣管(guan)內和焊(han)接區間(jian)的(de)空氣，防止產生(sheng)氣孔；焊(han)后延(yan)遲5～15s停止輸(shu)送保護氣體，以保證尚(shang)未冷(leng)卻(que)的(de)鎢(wu)極和熔池能(neng)在保護氣氛下冷(leng)卻(que)，防止氧化和產生(sheng)氣孔；自(zi)動接通和切斷保護氣源及引弧(hu)、穩弧(hu)的(de)電(dian)路，防止接觸引弧(hu)燒損鎢(wu)極和接頭產生(sheng)夾鎢(wu)缺陷；控制電(dian)源的(de)通斷；焊(han)接結束前(qian)電(dian)流能(neng)自(zi)動衰減，以消除弧(hu)坑和防止弧(hu)坑開(kai)裂。
②. 鎢極氬弧(hu)焊焊槍(qiang)（arc welding gun）
鎢極氬(ya)弧焊(han)焊(han)槍(qiang)(qiang)(qiang)由噴嘴、鎢極夾持裝(zhuang)置、導線(xian)、氣水(shui)(shui)輸送膠(jiao)管、啟(qi)動開關(guan)等零部件組成（結構(gou)詳見圖4-31）。根據適用的焊(han)接電流大小，焊(han)槍(qiang)(qiang)(qiang)分水(shui)(shui)冷式(shi)和氣冷式(shi)兩類。常(chang)用水(shui)(shui)冷卻式(shi)焊(han)槍(qiang)(qiang)(qiang)型號有QS-75°／400A、QS-75／500A等，可(ke)匹配(pei)在(zai)大功率氬(ya)弧焊(han)機上；氣冷卻式(shi)的焊(han)槍(qiang)(qiang)(qiang)型號有QQ-85／100A、QQ-85／200A等·可(ke)匹配(pei)在(zai)小功率氬(ya)弧焊(han)機上。
③. 氣體保護(hu)裝置(zhi)
氣(qi)(qi)(qi)(qi)體(ti)保護裝置(zhi)有(you)(you)氬氣(qi)(qi)(qi)(qi)瓶、減(jian)(jian)壓(ya)器(qi)和(he)流(liu)(liu)(liu)(liu)(liu)量計(ji)。氬氣(qi)(qi)(qi)(qi)瓶是儲存氬氣(qi)(qi)(qi)(qi)的壓(ya)力容(rong)器(qi)，使(shi)用(yong)(yong)(yong)(yong)時應(ying)(ying)(ying)注(zhu)意安全規則。按 GB 7144-1999《氣(qi)(qi)(qi)(qi)瓶顏色標志》的規定(ding)，氬氣(qi)(qi)(qi)(qi)瓶應(ying)(ying)(ying)為銀灰色，并(bing)標有(you)(you)“氬”（字(zi)的顏色為深綠色）字(zi)樣。使(shi)用(yong)(yong)(yong)(yong)中(zhong)(zhong)應(ying)(ying)(ying)注(zhu)意瓶內(nei)氬氣(qi)(qi)(qi)(qi)不(bu)得用(yong)(yong)(yong)(yong)盡，應(ying)(ying)(ying)保留0.5MPa的余氣(qi)(qi)(qi)(qi)，以防止(zhi)空氣(qi)(qi)(qi)(qi)混入而造成氬氣(qi)(qi)(qi)(qi)不(bu)純。減(jian)(jian)壓(ya)器(qi)可(ke)用(yong)(yong)(yong)(yong)普通氧(yang)氣(qi)(qi)(qi)(qi)減(jian)(jian)壓(ya)器(qi)QD-3A 和(he)QD-2A代用(yong)(yong)(yong)(yong)。流(liu)(liu)(liu)(liu)(liu)量計(ji)是標定(ding)通入氣(qi)(qi)(qi)(qi)體(ti)流(liu)(liu)(liu)(liu)(liu)量的裝置(zhi)，保證(zheng)氬氣(qi)(qi)(qi)(qi)在(zai)焊接過程中(zhong)(zhong)按給定(ding)的數量輸(shu)送。常用(yong)(yong)(yong)(yong)的有(you)(you)LZB型玻(bo)璃(li)轉子流(liu)(liu)(liu)(liu)(liu)量計(ji)或醫用(yong)(yong)(yong)(yong)流(liu)(liu)(liu)(liu)(liu)量計(ji)均可(ke)。但應(ying)(ying)(ying)注(zhu)意流(liu)(liu)(liu)(liu)(liu)量計(ji)的示(shi)(shi)值(zhi)受(shou)氣(qi)(qi)(qi)(qi)體(ti)密度的影響(xiang)。使(shi)用(yong)(yong)(yong)(yong)非氬氣(qi)(qi)(qi)(qi)專用(yong)(yong)(yong)(yong)流(liu)(liu)(liu)(liu)(liu)量計(ji)時，表(biao)中(zhong)(zhong)的示(shi)(shi)值(zhi)并(bing)非氬氣(qi)(qi)(qi)(qi)的真實流(liu)(liu)(liu)(liu)(liu)量。現(xian)在(zai)已有(you)(you)氬氣(qi)(qi)(qi)(qi)減(jian)(jian)壓(ya)器(qi)和(he)流(liu)(liu)(liu)(liu)(liu)量計(ji)結合一體(ti)的儀器(qi)，如YQAR-195，以及CO2減(jian)(jian)壓(ya)器(qi)和(he)流(liu)(liu)(liu)(liu)(liu)量計(ji)一體(ti)的YQT-195。
