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      新聞詳情

        焊接氣體淺析

      • 來源:氣體圈子 時間:2019-7-15 15:36

      焊接保護氣體(Welding Gases),氣體工業名詞,氣體保護焊由于具有焊接質量好,效率高,易實現自動化等優點而得以迅速發展。焊接保護氣體可以是單元氣體,也有二元,三元混合氣。采用焊接保護氣的目的在于提高焊縫質量,減少焊縫加熱作用帶寬度,避免材質氧化。單元氣體有氬氣,二氧化碳,二元混合氣有氬和氧,氬和二氧化碳,氬和氦,氬和氫混合氣。三元混合氣有氦,氬,二氧化碳混合氣。應用中視焊材不同選擇不同配比的焊接混合氣。

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      1、什么叫CO2焊接? 

      二氧化碳保護焊全稱二氧化碳氣體保護電弧焊。用純度> 99.98% CO2做保護氣體的熔化極氣體保護焊稱為CO2焊。 


      2.什么叫MAG焊接? 

      MAG(Metal Active Gas Arc Welding)焊是熔化極活性氣體保護電弧焊的英文簡稱。

      rBADvVoM9ceAe_7GAAT3nEj9YvM241.jpg

      它是在氬氣中加入少量的氧化性氣體(氧氣,二氧化碳或其混合氣體)混合而成的一種混合氣體保護焊。用混合氣體75--95% Ar + 25--5 % CO2 ,(標準配比:80%Ar + 20%CO2 )做保護氣體的熔化極氣體保護焊稱為MAG焊。 


      3.什么叫MIG焊接? 

      MIG焊(熔化極惰性氣體保護焊)英文:melt inert-gas welding使用熔化電極,以外加氣體作為電弧介質,并保護金屬熔滴、焊接熔池和焊接區高溫金屬的電弧焊方法,稱為熔化極氣體保護電弧焊。


      1〉用高純度氬氣Ar≥ 99.99%做保護氣體的熔化極氣體保護焊接鋁及鋁合金、銅及銅合金等有色金屬; 

      2〉用98% Ar + 2%O2 95%Ar + 5%CO2做保護氣體的熔化極氣體保護焊接實心不銹鋼焊絲的工藝方法--稱為MIG焊。 

      3〉用氦+氬惰性混合氣做保護的熔化極氣體保護焊。 更多氣體知識,請關注微信公眾號gasgroup


      4.什么叫TIG(鎢極氬弧焊)焊接? 

      TIG焊(Tungsten Inert Gas Welding),又稱為非熔化極惰性氣體保護電弧焊、鎢極惰性氣體保護焊。保護氣體可采用氬氣、氦氣或氬氦混合氣體。在特殊應用場合,可添加小量的氫。用氬氣作為保護氣體的稱鎢極氬弧焊(用純鎢或活化鎢(釷鎢、鈰鎢、鋯鎢、鑭鎢)作為不熔化電極的惰性氣體保護電弧焊),用氦氣的稱鎢極氦弧焊。

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      5.什么叫SMAW(焊條電弧焊)焊接? 

      用手工操縱焊條進行焊接的電弧焊方法。 


      6.什么叫碳弧氣刨? 

      使用碳棒作為電極,與工件間產生電弧,用壓縮空氣(壓力0.5—0.7Mpa)將熔化金屬吹除的一種表面加工的方法。常用來焊縫清根、刨坡口、返修缺陷等。 


      7.為什么CO2焊比焊條電弧焊效率高? 

      1CO2焊比焊條電弧焊熔化速度和熔化系數高1-3倍;

      2〉坡口截面比焊條減小50%,熔敷金屬量減少1/2 

      3〉輔助時間是焊條電弧焊的50% 

      三項合計:CO2焊的工效與焊條電弧焊相比提高倍數2.02--3.88 


      8.為什么CO2焊接接頭比焊條電弧焊的焊接接頭質量好? 

      CO2焊縫熱影響區小,焊接變形小;CO2焊縫含氫量低(≤1.6ML/100g),氣孔及裂紋傾向小;CO2焊縫成形好,表面及內部缺陷少,探傷合格率高于焊條電弧焊。 


      9.為什么CO2焊比焊條電弧焊的綜合成本低? 

      1〉坡口截面積減少36-54%, 節省填充金屬量; 

      2〉降低耗電量65.4% 

      3〉設備臺班費較焊條電弧焊降低67-80%,降低成本20-40% 

      4〉減少人工費、工時費,降低成本10-16% 

      5〉節省輔助工時、輔料消耗及矯正變形費用; 

      綜合五項,CO2焊能使焊接總成本降低 39.6-78.7%,平均降低59% 


      10.什么叫低頻脈沖?適用哪些焊接? 

      脈沖頻率在0.5—30Hz的脈沖電弧叫作低頻脈沖焊接。主要用于不銹鋼、鋼和鈦等有色金屬的TIG焊。


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