22B-B5P0F104

22B-B5P0F104

保護(hù)氣體是通過噴嘴口以的壓力射出到達(dá)工件表面的，噴嘴的流體力學(xué)形狀和出口的直徑大小十分重要。它以足夠大以驅(qū)使噴出的保護(hù)氣體覆蓋焊接表面，但為了有效保護(hù)透鏡，阻止金屬蒸氣污染或金屬飛濺損傷透鏡，噴口大小也要加以限制。流量也要加以控制，否則保護(hù)氣的層流變成紊流，大氣卷入熔池，終形成氣孔。

為了提高保護(hù)效果，還可用附加的側(cè)向吹氣的方式，即通過一較小直徑的噴管將保護(hù)氣體以的角度直接射入深熔焊接的小孔。保護(hù)氣體不僅抑制了工件表面的等離子體云，而且對(duì)孔內(nèi)的等離子體及小孔的形成施加影響，熔深進(jìn)一步增大，獲得深寬比較為理想的焊縫。但是，此種方法要求控制氣流量大小、方向，否則容易產(chǎn)生紊流而破壞熔池，導(dǎo)致焊接過程難以穩(wěn)定。

6）透鏡焦距。焊接時(shí)通常采用聚焦方式會(huì)聚激光，一般選用63~254mm（2.5”~10”）焦距的透鏡。聚焦光斑大小與焦距成正比，焦距越短，光斑越小。但焦距長短也影響焦深，即焦深隨著焦距同步增加，所以短焦距可提高功率密度，但因焦深小，保持透鏡與工件的間距，且熔深也不大。由于受焊接過程中產(chǎn)生的飛濺物和激光模式的影響，實(shí)際焊接使用的短焦深多為焦距126mm（5”）。當(dāng)接縫較大或需要通過加大光斑尺寸來增加焊縫時(shí)，可選擇254mm（10”）焦距的透鏡，在此情況下，為了達(dá)到深熔小孔效應(yīng)，需要更高的激光輸出功率（功率密度）。

APPLIED MATERIALS WPLATE PERF 125 MM OXIDE 0020-10122

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