我們知道根據國家安全用電標準，家用電器使用是要求要有接地措施的。激光焊接機作為工業加工設備更是如此，無論是采用民用220V用電，還是380V工業用電，都是要求電路必須要有保護措施。這樣才能確保焊接設備安全、操作人員安全和設備正常運行。

接地不僅對操作人員來說更安全，對激光焊接機還有兩方面的好處，一方面，隨著時代的進步，強功能高價值焊接設備的廣泛使用，要求提供更加可靠的接地保護；另一方面，微電子技術的應用，使得現代焊接設備要求更低的接地電阻，抗信號干擾。

或(huo)許有很多人還不明白接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)到(dao)底指什(shen)么(me)，有什(shen)么(me)作(zuo)用的(de)(de)(de)(de)(de)(de)？在(zai)此(ci)，通(tong)發激光小(xiao)編給大家(jia)普及(ji)一(yi)下(xia)。我們常說的(de)(de)(de)(de)(de)(de)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)是指將帶(dai)電(dian)(dian)(dian)(dian)導(dao)(dao)體(ti)與大地(di)(di)(di)(di)(di)(di)(di)(di)相接(jie)(jie)(jie)觸的(de)(de)(de)(de)(de)(de)現(xian)象。在(zai)該(gai)定義中帶(dai)電(dian)(dian)(dian)(dian)導(dao)(dao)體(ti)對(dui)大地(di)(di)(di)(di)(di)(di)(di)(di)放電(dian)(dian)(dian)(dian)。那么(me)什(shen)么(me)是"地(di)(di)(di)(di)(di)(di)(di)(di)"呢？物理學(xue)上就(jiu)是以(yi)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)點為(wei)(wei)(wei)圓心，以(yi)距離S為(wei)(wei)(wei)半徑的(de)(de)(de)(de)(de)(de)半球形以(yi)遠、0電(dian)(dian)(dian)(dian)位(wei)的(de)(de)(de)(de)(de)(de)地(di)(di)(di)(di)(di)(di)(di)(di)方(fang)，稱作(zuo)電(dian)(dian)(dian)(dian)氣上的(de)(de)(de)(de)(de)(de)"地(di)(di)(di)(di)(di)(di)(di)(di)"。距離S以(yi)內為(wei)(wei)(wei)流(liu)散(san)電(dian)(dian)(dian)(dian)場，場強隨S減小(xiao)而增強。電(dian)(dian)(dian)(dian)場中的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)為(wei)(wei)(wei)擴散(san)電(dian)(dian)(dian)(dian)流(liu)，電(dian)(dian)(dian)(dian)流(liu)受到(dao)的(de)(de)(de)(de)(de)(de)阻力(li)稱流(liu)散(san)電(dian)(dian)(dian)(dian)阻。一(yi)般確認：在(zai)干燥的(de)(de)(de)(de)(de)(de)氣候條件下(xia)S為(wei)(wei)(wei)20m。在(zai)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)點，帶(dai)電(dian)(dian)(dian)(dian)導(dao)(dao)體(ti)與大地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)位(wei)等于0處的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)壓(ya)(ya)稱接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)壓(ya)(ya)U0；流(liu)入大地(di)(di)(di)(di)(di)(di)(di)(di)的(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)稱接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)短路電(dian)(dian)(dian)(dian)流(liu)I0；它們的(de)(de)(de)(de)(de)(de)比值稱作(zuo)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)阻R0，即R0=U0/I0。如變換為(wei)(wei)(wei)I0*R0=U0，更容(rong)易(yi)看(kan)出，接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)阻R0與接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)壓(ya)(ya)U0成正比關系(xi)。所以(yi)人們建造的(de)(de)(de)(de)(de)(de)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)裝置就(jiu)是將接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)阻R0的(de)(de)(de)(de)(de)(de)值做得盡量小(xiao)，使(shi)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)裝置在(zai)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)流(liu)I0通(tong)過時接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)導(dao)(dao)線與地(di)(di)(di)(di)(di)(di)(di)(di)的(de)(de)(de)(de)(de)(de)接(jie)(jie)(jie)地(di)(di)(di)(di)(di)(di)(di)(di)電(dian)(dian)(dian)(dian)壓(ya)(ya)U0盡量低。

事實上(shang)，我們日(ri)常中家庭(ting)(ting)使用的(de)(de)(de)接地做的(de)(de)(de)比較(jiao)簡單(下圖(tu):家庭(ting)(ting)電(dian)路(lu)接地方式)，就(jiu)是(shi)直(zhi)接把(ba)接地線埋入地里，以防止家電(dian)設(she)備外(wai)殼帶電(dian)，并減少(shao)靜電(dian)對電(dian)子元(yuan)件的(de)(de)(de)干擾。但在工(gong)業的(de)(de)(de)三(san)廂四線中，接地就(jiu)比較(jiao)嚴格了，而且不允許(xu)直(zhi)接將設(she)備外(wai)殼接地，而是(shi)采用接零保護。

所以，接地是激光焊接機能否安全使用正常運行的關鍵，是必不可少的措施。