當需要采(cai)用熔化(hua)極(ji)氣體(ti)保(bao)護(hu)焊(han)、藥芯焊(han)絲氣體(ti)保(bao)護(hu)焊(han)或(huo)鎢極(ji)弧焊(han)將屏柵、金屬絲網或(huo)延伸金屬焊(han)接到鋼結構(gou)框架上，進(jin)行焊(han)接時(shi)金屬絲網容易產生燒穿和(he)焊(han)縫未熔合現象(xiang)，應如何進(jin)行處理？

在金屬絲(si)網(wang)(wang)或延伸金屬上(shang)(shang)放(fang)(fang)置(zhi)非金屬墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)并且將墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)、金屬絲(si)網(wang)(wang)和框架(jia)夾緊(jin)在一(yi)(yi)起，不允許采(cai)用(yong)含(han)鉻或鍍鋅墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)，墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)應采(cai)用(yong)未(wei)涂敷的(de)，陶(tao)質焊(han)(han)接(jie)墊(dian)(dian)(dian)(dian)(dian)片，在被(bei)(bei)焊(han)(han)位(wei)置(zhi)的(de)墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)上(shang)(shang)部放(fang)(fang)置(zhi)一(yi)(yi)個(ge)(ge)更大(da)的(de)墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)作為散熱片。上(shang)(shang)墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)應具(ju)有一(yi)(yi)個(ge)(ge)比(bi)下墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)更大(da)的(de)孔(kong)(kong)，以(yi)避免(mian)上(shang)(shang)墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)也被(bei)(bei)焊(han)(han)接(jie)在一(yi)(yi)起。然(ran)后通過墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)的(de)兩(liang)個(ge)(ge)孔(kong)(kong)進行塞(sai)(sai)焊(han)(han)，應使焊(han)(han)縫處(chu)于下墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)部分。操(cao)作者可以(yi)采(cai)取(qu)一(yi)(yi)些其他(ta)的(de)方法得到足夠的(de)熱量并進行焊(han)(han)接(jie)，注意要防止周圍屏柵或金屬絲(si)網(wang)(wang)燒穿， 另一(yi)(yi)種(zhong)方法是采(cai)用(yong)一(yi)(yi)個(ge)(ge)帶孔(kong)(kong)的(de)金屬板條，將孔(kong)(kong)對準需(xu)要焊(han)(han)接(jie)的(de)部位(wei)，并放(fang)(fang)置(zhi)散熱墊(dian)(dian)(dian)(dian)(dian)圈(quan)(quan)(quan)(quan)，然(ran)后進行塞(sai)(sai)焊(han)(han)。

鋼結(jie)構制造過程(cheng)中，重要受力節(jie)點常有許多(duo)條(tiao)焊(han)縫要求熔透探傷(shang)。傳(chuan)統的(de)焊(han)接(jie)(jie)工藝是碳弧氣刨反面(mian)清根(gen)工藝，近些年(nian)來，鋼結(jie)構行業開始(shi)使(shi)用焊(han)接(jie)(jie)陶瓷(ci)(ci)襯墊(dian)免清根(gen)工藝，這是一種在(zai)焊(han)縫坡(po)口反面(mian)敷設(she)焊(han)接(jie)(jie)陶瓷(ci)(ci)襯墊(dian)后在(zai)正面(mian)進行施焊(han)，反面(mian)焊(han)縫強制成(cheng)型，使(shi)焊(han)縫飽(bao)滿、焊(han)道整齊的(de)焊(han)接(jie)(jie)方(fang)法(fa)。在(zai)大多(duo)數焊(han)接(jie)(jie)工況下，焊(han)接(jie)(jie)墊(dian)片(pian)，后者比前者的(de)優勢(shi)越(yue)來越(yue)明顯(xian)，焊(han)接(jie)(jie)墊(dian)片(pian)批發，有逐漸大部分取代前者的(de)趨勢(shi)。

焊(han)接襯(chen)墊是焊(han)接工藝裝備焊(han)中的一種，是為保證接頭根部(bu)焊(han)透和焊(han)縫背(bei)面(mian)成形，沿接頭背(bei)面(mian)預置的一種襯(chen)托裝置。采用陶瓷(ci)，焊(han)縫整齊，不(bu)易(yi)開裂，高強(qiang)粘性。更(geng)有如下特點：

陶瓷打造-規格(ge)標準嚴(yan)格(ge)把控，防潮性能(neng)佳，耐高溫，可焊接墊片，其熔池(chi)結晶(jing)方向(xiang)會直于(yu)焊縫(feng)(feng)中心，焊縫(feng)(feng)更整齊(qi)。

電(dian)絕(jue)緣-常(chang)溫(wen)下為絕(jue)緣體(ti)，電(dian)阻率高，可用于要求(qiu)絕(jue)緣的設(she)備中。

防磁-產(chan)品材(cai)質無(wu)瓷磁，故不(bu)塵(chen)，可(ke)以減少表(biao)面剝(bo)落。

耐腐(fu)蝕-無論在(zai)強酸、強堿、無機(ji)、有機(ji)鹽等(deng)條件下(xia)都不受影響。