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id="ycu8fmy" 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>浙江H13焊絲,焊絲</p><p><span>***更新：</span>2020-10-31 01:08:31</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="exj7zgn" 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(jī): </span>021-69726282</p><p><span>地址: </span>顧北東路365號C區(qū)1101</p><p>[當(dāng)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="ov8pb2w" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="t2nipmj" class="box"><p><p> 三)面罩及其它防護(hù)用具面罩的主要作用是保護(hù)電焊工的眼睛和面部不受電弧光的輻射和灼傷，面罩分手持式和頭盔式兩種。面罩上的護(hù)目玻璃起到減弱電弧光并過濾紅外線，浙江H13焊絲、紫外線的作用。護(hù)目玻璃有不同色號、目前以黑綠色的為多，應(yīng)根據(jù)電焊工的年齡和視力情況盡量選擇顏色較深的護(hù)目玻璃以保護(hù)視力。護(hù)目玻璃外還加有相同尺寸的一般玻璃，以防金屬飛濺沾污護(hù)目玻璃。焊工用護(hù)目遮光鏡片的選用可按表11—8進(jìn)行。其它防護(hù)用品有電焊工在工作時需佩帶的**電焊手套和護(hù)腳，以及清渣時應(yīng)戴的平光眼鏡，浙江H13焊絲。六，浙江H13焊絲、交流弧焊機(jī)與直流弧焊機(jī)的比較交流弧焊機(jī)的主要優(yōu)點(diǎn)是成本低、制造維護(hù)簡單，噪聲較?。蝗秉c(diǎn)是不能適應(yīng)堿性焊條，且焊接電壓、電流容易受到電網(wǎng)波動的干擾。直流弧焊機(jī)的優(yōu)點(diǎn)是電弧穩(wěn)定，焊條適應(yīng)性強(qiáng)；缺點(diǎn)是成本較高，制造維修較復(fù)雜，重量較重。但由于優(yōu)點(diǎn)明顯，直流弧焊機(jī)是大有前途的電焊機(jī)。表3—7列出了兩類焊機(jī)的性能比較。焊材內(nèi)部空間受到限制，焊劑顆粒的大小愈顯得重要，顆粒間形成類似鳥.巢般結(jié)合，焊劑成份元素不均勻。浙江H13焊絲</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江H13焊絲,焊絲" src="http://tyunfile.71360.com/UploadFile/shjianmin2/637179265685263672/7237309.png"></div><p> 此時應(yīng)選用抗裂性較好的堿性焊條。（4）根據(jù)焊件的工作條件、使用性能和幾何形狀選用焊條1）載荷性質(zhì)在承受動載荷或沖擊載荷情況下，除了要求保證抗拉強(qiáng)度外，還對焊縫金屬的塑性和沖擊韌度有較高的要求，推薦使用堿性焊條。2）工作介質(zhì)若焊件是在腐蝕介質(zhì)中工作的不銹鋼件或其它耐腐蝕材料，必須根據(jù)介質(zhì)種類、濃度、工作溫度等情況，選擇或按設(shè)計(jì)規(guī)定采用相應(yīng)的不銹鋼焊條或其它耐腐蝕焊條。3）幾何形狀根據(jù)焊件幾何形狀的復(fù)雜程度、剛性的大小、焊接坡口制備情況以及焊接部位所處的位臵選用焊條，應(yīng)遵循下列原則：[1]形狀復(fù)雜或大厚度的焊件，由于焊縫金屬在冷收縮時會產(chǎn)生較大的應(yīng)力，易形成裂紋，因此應(yīng)選用抗裂性較高的焊條，如堿性焊條。[2]某些難以清理干凈的焊接部位，應(yīng)選用氧化性強(qiáng)，對鐵銹、氧化皮和油垢敏感性較小的酸性焊條，以免產(chǎn)生氣孔等缺點(diǎn)。[3]焊接部件因受條件限制不能翻轉(zhuǎn)時，必須選用能在任何空間位臵（全位臵）進(jìn)行焊接的焊條。（5）根據(jù)工地設(shè)備和勞動條件選用焊條1）根據(jù)工地設(shè)備狀況選用焊條[1]在沒有直流焊機(jī)的工作場所，不能選用***用直流電源的堿性焊條，應(yīng)選用交流焊條或交、直流兩用的堿性焊條。[2]對于某些焊件，若選用一般焊條。浙江H13焊絲鉬、鉻、碳、錳、鎳及釩等合金元素的添加，可以提高（改善）熔填金屬的強(qiáng)度、延性、硬度及韌性等。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江H13焊絲,焊絲" src="http://tyunfile.71360.com/UploadFile/shjianmin2/637179265664882812/4463123.png"></div><p> 去渣容易，不易產(chǎn)生氣孔和夾渣。但藥皮氧化性強(qiáng)使合金元素?zé)龘p大,機(jī)械性能（沖擊韌性）比較低。酸性焊條一般均可用交直流電源。典型的酸性焊條是J422。堿性焊條焊接的焊縫機(jī)械性能良好，特別是沖擊韌性比較高，主要用于重要結(jié)構(gòu)的焊接。氟化物粉塵有害，應(yīng)加強(qiáng)現(xiàn)場的通風(fēng)排氣，以改善勞動條件。典型的堿性焊條有J507。按焊條藥皮主要成分分類當(dāng)藥皮中含有30％以上的二氧化鈦及20％以下的鈣、鎂的碳酸鹽時，就稱為鈦鈣型。結(jié)構(gòu)鋼焊條牌號J422，中“J”表示結(jié)構(gòu)鋼焊條,按用途分***、二位數(shù)字“42”表示焊縫金屬的抗拉強(qiáng)度等級（用MPa值的1/10表示），末位數(shù)字“2”表示藥皮類型及焊接電源的種類奧氏體鉻鎳不銹鋼焊條牌號A132中“A”表示奧氏體不銹鋼焊條；***、第二位數(shù)字表示焊縫金屬主要化學(xué)成分組成。末位數(shù)字表示藥皮類型和焊接電源種類焊條型號：是以焊條國家標(biāo)準(zhǔn)為依據(jù)、反映焊條主要特性的一種表示方法。焊條型號根據(jù)焊縫金屬的力學(xué)性能、藥皮類型、焊接位置和焊接電流種類劃分。碳鋼焊條型號E4315中“E”表示焊條；前兩位數(shù)字表示熔敷金屬抗拉強(qiáng)度的最小值，單位為MPa值的1/10；第三位數(shù)字表示焊條焊接位置，“0”及“1”表示用于全位置焊接（平、立、仰、橫）。</p><p> 注：1、直徑不大于、E5015、E5016和E5018型焊條及直徑不大于，可適用于立焊和仰焊。2、E4322型焊條適宜單道焊。焊條型號舉例如下：例14、焊條的選用（1）結(jié)構(gòu)鋼（低碳鋼、中碳鋼、普通低合金鋼）焊條的選用采用結(jié)構(gòu)鋼制造的焊接結(jié)構(gòu)，大多要求焊縫金屬與母材等強(qiáng)度，此時可按結(jié)構(gòu)鋼的強(qiáng)度選擇相應(yīng)強(qiáng)度等級的焊條。選擇時應(yīng)注意以下兩點(diǎn)：1）鋼材的強(qiáng)度等級是按屈服點(diǎn)劃分的，而結(jié)構(gòu)鋼焊條的強(qiáng)度等級系指其抗拉強(qiáng)度的比較低保證值，兩者是不一致的。通常應(yīng)選擇抗拉強(qiáng)度保證值與母材相同或稍高的焊條。2）焊縫強(qiáng)度不是比母材高出愈多愈好，而應(yīng)等于或稍高于母材。如果焊縫強(qiáng)度過高，往往使焊縫的塑性下降，反而有害。當(dāng)焊接接頭不要求焊縫與其等強(qiáng)度時，可選用抗拉強(qiáng)度較低的焊條。（2）合金結(jié)構(gòu)鋼焊條的選用合金結(jié)構(gòu)鋼焊接時，通常均不要求焊縫金屬的合金成分與該鋼種的合金成分相同或相近，而主要考慮等強(qiáng)度。但如果母材是耐熱鋼、耐腐蝕鋼時，從保證焊接接頭的耐熱、耐腐蝕性能出發(fā)，則要求焊縫金屬的主要合金成分與母材相同或相近。此時，應(yīng)根據(jù)母材的化學(xué)成分選用焊條。（3）根據(jù)母材抗裂性要求選用焊條母材成分中，如果含C或S、P等雜質(zhì)較高時，很容易在焊縫中形成裂紋。含有造渣、造氣和穩(wěn)弧成分的藥芯焊絲焊接時不需要保護(hù)氣體，稱自保護(hù)藥芯焊絲。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="浙江H13焊絲,焊絲" src="http://tyunfile.71360.com/UploadFile/shjianmin2/637179265671406250/559850.png"></div><p> 如果*是引孤時使用高頻振蕩器，因時間較短，影響較小，如果頻繁起弧，或者把高頻振蕩器做為穩(wěn)弧裝置在焊接過程中持續(xù)使用，則高頻電磁場可成為有害因素之一。放射性的危害氬弧焊使用的釷鎢含有l(wèi)％一％的氧化釷。釷是一種放射性元素，能放射出α，β，γ三種射線。在焊接過程及與釷鎢棒的接觸過程中，可能會受到放射線的影響。通過大量調(diào)查，每天消耗的釷鎢棒*100--200mg，放射劑量極微，對人體影響不大。但是在容器內(nèi)焊接時，通風(fēng)不暢，煙塵中的放射性粒子有可能超過衛(wèi)生標(biāo)準(zhǔn)；二是在磨削釷鎢棒時及存放釷鎢棒的地點(diǎn)，放射性氣溶膠和放射性粉塵的濃度，可達(dá)到甚至超過衛(wèi)生標(biāo)準(zhǔn)。放射性物質(zhì)侵入體內(nèi)，可引起慢性放射性疾病，形成內(nèi)照射，主要表現(xiàn)在一般機(jī)能狀態(tài)減弱，可以看到明顯的衰弱無力、對傳染病的抵抗力明顯降低、體重減輕等癥狀。百度百科：放射性氣溶膠，懸浮在空氣或其他氣體中含有放射性核素的固體或液體微粒。固體或液體放射性微粒懸浮在空氣或氣體介質(zhì)中形成的分散體系。氣溶膠的基本特性是不穩(wěn)定,小于；1～10微米的微粒沉降緩慢，懸浮在空氣中較久。放射性氣溶膠的電離效應(yīng)高、濃度低、微粒上易帶電（由放射性衰變產(chǎn)生）。焊接時，送絲較實(shí)心焊絲困難。浙江H13焊絲</p><p style="text-indent:25px">在氣焊和鎢極氣體保護(hù)電弧焊時，焊絲用作填充金屬。浙江H13焊絲</p><p> 紅外線輻射約為普通焊條電弧焊的1～，氬弧焊電弧產(chǎn)生的紫外線輻射約為焊條電弧焊的5～20倍。在有限空間內(nèi)焊接時，臭氧的濃度可增大到危險程度，在焊接過程中，還會產(chǎn)生二氧化碳，一氧化碳等有害氣體和金屬粉塵，這些都對焊工產(chǎn)生一定的危害。所以我們在焊接過程中要做好防護(hù)，選用電極的材料，要盡量選用放射性小的鈰鎢。磨削電極時，要戴好口罩，手套，且工作后要洗手，讓危害降到比較低。高頻電磁場的危害焊接通常使用高頻振蕩器的頻率為200～500kHz，電壓2500～3500V，電場強(qiáng)度140～190V/m。引弧時，產(chǎn)生的高頻電磁場強(qiáng)度在60～110V/m之間，超過參考衛(wèi)生標(biāo)準(zhǔn)(20V/m)數(shù)倍。在非熔化極氬弧焊和等離子弧焊割時，常用高頻振蕩器來激發(fā)引弧，有的交流氬弧焊機(jī)還用高頻振蕩器來穩(wěn)定電弧。人體在高頻電磁場作用下，能吸收一定的輻射能量，產(chǎn)生生物學(xué)效應(yīng)，主要是熱作用。高頻電磁場強(qiáng)度受許多因素影響，如距離，振蕩器和振蕩回路越近場強(qiáng)越高，反之則越低。此外，與高頻部分的屏蔽程度等有關(guān)。人體在高頻電磁場作用下會產(chǎn)生生物學(xué)效應(yīng)，焊工長期接觸高頻電磁場能引起植物神經(jīng)功能紊亂和神經(jīng)衰弱。表現(xiàn)為全身不適、頭昏***、疲乏、食欲不振、***及血壓偏低等癥狀。浙江H13焊絲</p><p style="text-indent:25px">簡敏精密五金制造(上海)有限公司致力于五金、工具，是一家生產(chǎn)型的公司。公司業(yè)務(wù)涵蓋模具焊條，模具焊絲，特種焊絲，特種焊條等，價格合理，品質(zhì)有保證。公司秉持誠信為本的經(jīng)營理念，在五金、工具深耕多年，以技術(shù)為先導(dǎo)，以自主產(chǎn)品為重點(diǎn)，發(fā)揮人才優(yōu)勢，打造五金、工具良好品牌。簡敏五金制造憑借創(chuàng)新的產(chǎn)品、專業(yè)的服務(wù)、眾多的成功案例積累起來的聲譽(yù)和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br 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