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href="http://www.cdcfah.com/cp/first-_wjgj/">五金、工具</a>?<a href="http://www.cdcfah.com/cp/second-wjgj_hjclyfjqh/">焊接材料與附件</a>?<a href="http://www.cdcfah.com/cp/third-hjclyfjqh_hansi/">焊絲</a>?福建模具焊絲訂購歡迎咨詢簡敏精密五金制造供應(yīng)</p><div id="ncum23m" class="leftbox clearfix"><h1>福建模具焊絲訂購歡迎咨詢簡敏精密五金制造供應(yīng)</h1><div id="wgiprq3" class="proBig"><div id="8sn73vs" class="bigimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UploadFile/shjianmin2/637179265671318359/8288159.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="7tvs22i" class="smallimg"><div><p class="pic"><img src="http://tyunfile.71360.com/UploadFile/shjianmin2/637179265671318359/8288159.jpg" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="j23jace" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>福建模具焊絲訂購</p><p><span>***更新：</span>2020-06-24 15:25:23</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="ujbtlxe" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">簡敏精密五金制造(上海)有限公司</a></p><p><span>聯(lián)系人：</span>龔先生</p><p><span>郵箱: </span></p><p><span>電話: </span>13818473006</p><p><span>傳真: </span>021_69726282</p><p><span>網(wǎng)址: </span></p><p><span>手機: </span>021-69726282</p><p><span>地址: </span>顧北東路365號C區(qū)1101</p><p>[當前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="8t7o32q" class="page-proshow02"><p class="title">詳細說明</p><div id="q238rb8" class="box"><p><p> 焊條烘干的目的焊條在儲存、運輸期間藥皮會吸潮，使藥皮中的水分增加。焊條使用前進行烘干的作用就是降低藥此中的含水量，其目的是：1）減少焊接過程中的飛濺，使焊接電弧能夠穩(wěn)定地燃燒。2）防止在焊縫中產(chǎn)生氣孔。3）防止產(chǎn)生在焊接某些低合金鋼時由氫引起的延遲裂紋。根據(jù)JB3223—83《焊條質(zhì)量管理規(guī)程》的規(guī)定，酸性焊條烘干的溫度為75～150℃時間為1～2h。酸性焊條由于對水分產(chǎn)生氣孔的敏感性不大，所以烘干溫度相對要低一些。堿性焊條的烘干溫度350--400℃，時間1--2小時，烘干后放在100--150℃的保溫箱內(nèi)，隨用隨取。JB4709中有推薦保溫時間和溫度(非強制性標準),不過實際使用時比較好參考焊條質(zhì)保書中的溫度及時間要求！堿性焊條過高的烘干溫度也是不合適的：一是浪費能源；其次是當烘干溫度超過500℃時，藥皮中的某些成分（如CaCO3）就要發(fā)生分解，起不到應(yīng)有的保護作用，福建模具焊絲訂購。焊條烘干時的注意事項焊條烘干時應(yīng)注意如下事項：1）低氫型焊條在常溫下超過4h時，福建模具焊絲訂購，應(yīng)重新烘干。重復(fù)烘干次數(shù)不宜超過3次，福建模具焊絲訂購。2）烘干焊條時，禁止將焊條突然放進高溫爐內(nèi)，或從高溫爐中突然取出冷卻，防止焊條因驟冷驟熱而發(fā)生的藥皮開裂現(xiàn)象。3）焊條烘干時應(yīng)作記錄。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建模具焊絲訂購" src="http://tyunfile.71360.com/UploadFile/shjianmin2/637179265671318359/8288159.jpg"></div><p> 按適用范圍不同，可分為斜三角形和正三角形兩種運條方法。其中斜三角形運條法適用于焊接T形接頭的仰焊縫和有坡口的橫焊縫。其特點是能夠通過焊條的擺動控制熔化金屬，促使焊縫成形良好。正三角形運條法*適用于開坡口的對接接頭和T形接頭的立焊。其特點是一次能焊出較厚的焊縫斷面，有利于提高生產(chǎn)率，而且焊縫不易產(chǎn)生夾渣等缺點。三角形運條法6)圓圈形運條法。如圖3—22所示，將焊條末端連續(xù)作圓圈運動，并不斷前進。這種運條方法又分正圓圈和斜圓圈兩種。正圓圈運條法只適于焊接較厚工件的平焊縫，其優(yōu)點是能使熔化金屬有足夠高的溫度，有利于氣體從熔池中逸出，可防止焊縫產(chǎn)生氣孔。斜圓圈運條法適用于T形接頭的橫焊(平角焊)和仰焊以及對接接頭的橫焊縫，其特點是可控制熔化金屬不受重力影響，能防止金屬液體下淌，有助于焊縫成形。圓圈形運條法(三)收尾電弧中斷和焊接結(jié)束時，應(yīng)把收尾處的弧坑填滿。若收尾時立即拉斷電弧，則會形成比焊件表面低的弧坑。在弧坑處常出現(xiàn)疏松、裂紋、氣孔、夾渣等現(xiàn)象，因此焊縫完成時的收尾動作不*是熄滅電弧，而且要填滿弧坑。收尾動作有以下幾種：(1)劃圈收尾法。焊條移至焊縫終點時，作圓圈運動，直到填滿弧坑再拉斷電弧。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建模具焊絲訂購" src="http://tyunfile.71360.com/UploadFile/shjianmin2/637179265669208984/3318362.png"></div><p> 7、為使氬氣很好地保護焊接熔池，和便于施焊操作，鎢極中心線與焊接處工件一般應(yīng)保持80~85°角,填充焊絲與工件表面夾角應(yīng)盡可能地小，一般為10°左右。8、防風與換氣。有風的地方，務(wù)請采取擋網(wǎng)的措施，而在室內(nèi)則應(yīng)采取適當?shù)膿Q氣措施。二、不銹鋼MIG焊要點及注意事項1、采用平特性焊接電源，直流時采用反極性(焊絲接正極)2、一般采用純氬氣(純度為)或Ar+2%O2,流量以20~25L/min為宜。3、電弧長度，不銹鋼的MIG焊接，一般都在噴射過渡的條件下來施焊，電壓要調(diào)整到弧長在4~6mm的程度。4、防風。MIG焊接容易受到風的影響，有時微風而產(chǎn)生氣孔，所以風速在，都應(yīng)當采取防風措施。三、不銹鋼藥芯焊絲焊接要點及注意事項1、采用平特性焊接電源，直流焊接時采用反極性。使用一般的CO2焊機就可以施焊，但送絲輪的壓力請稍調(diào)松。2、保護氣體一般為二氧化碳氣體，氣體流量以20~25L/min較適宜。3、焊嘴與工件間的距離以15~25mm為宜。4、干伸長度，一般的焊接電流為250A以下時約15mm，250A以上時約20~25mm較為合適。～～～～～～～～～～～～～～氬弧焊對人體有多大危害？一定要重視！焊接技術(shù)氬弧焊的危害程度要比焊條電弧焊相對來說要大，但是沒有大到讓人望而生畏的地步。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/376117.html</p></div></div></div></div></div><div id="8eia3bo" class="page-right twoColRt"><div id="8k8fuqs" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="kumebd8" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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