碳素结构钢及低合金高强钢焊接方法选詠E/title> <meta name="keywords" content="碳素结构钢及低合金高强钢焊接方法选詠E机械知识,中国机械蛠E> <meta name="description" content="碳素结构钢及低合金高强钢焊接方法选詠E机械知识,中国机械蛠E> <body>  <table width="756" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td width="548" rowspan="2" valign="top" style="border:1px solid #E0CBA7"> <table width="90%" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td height="13" class="td_b2" align="center">碳素结构钢及低合金高强钢焊接方法选詠E/td> <br> </tr> <tr> <td height="14" class="td_b2"><hr align="center" size="2" color="#666666"></td> </tr> <tr> <td align="center" valign="top"> <table width="95%" height="92" align="center" cellpadding="0" cellspacing="0"> <tr> <td height="25" class="LL"><span id="fp"><P>　　关于三峡工程所用两种钢的韧性控制问题，16MR焊接在我国已很有经验；对于610U2钢，制詠EС煞制ヅ浜侠土陡旨际醺叱珻EQ和PCM很低，综合性能很好，其冲击韧性在-20℃时均磥E00J以上；在选择焊材和焊接方法上，三峡的实践证明手工焊冲击韧性赃；但不能因此则认为只能用手工焊。 </P><br /> <P>　　根据以上分析，提高焊穪E托跃龆ㄓ诤辖鸹屠淙此俣?线能量和子热等)。而合金化靠选择焊材和保证过渡，因此，手工焊和气保焊药芯丝较有利，因为在国内手工焊条配套浍，两者均是气詠E媳；ぃ渌丒椒ㄒ捕伎梢员Ｖた刂坪阜丒煞郑欢越丒丒捎谀覆囊讯ǎΥ雍附庸ひ丈峡刂葡吣芰考霸と仁侄巍Ｋ圆还苌鲜龅哪侵趾附臃椒ǎ灰苎≡窈鲜实暮覆暮秃附庸ひ眨杀Ｖと托砸螅匀托灾副丒囊笥蒲Ф实薄?</P><br /> <P>　　从青云和葛洲坝集团提供的材料看，实验虽还不蛠E疲菀餐丒得鞔私崧?紒E.1，6.2内容)。无限制提高冲击韧度裕量不但在经济上不可取，在保证质量方面也无大好处，因为冲击韧度是代柄畿性和强度的综合指标，冲击韧度很高时，σs会相应提高，断裂韧性的指眮E裂纹容限尺寸就会减小，所以接头冲击韧度数值应保证其淹平均值磥E侥覆牡纳杓票Ｖぶ登矣幸欢ㄔＡ考纯桑挥σ阅覆氖挡庵滴丒肌?</P><br /> <P> 6、关于C02实心焊丝和药芯焊丝焊接 </P><br /> <P> 6.1 关于实心焊丝的焊接 </P><br /> <P>　　实心焊丝气保护焊应是这两种钢的首选工艺方法，不仅可在厂房内预制，还应用到工地安装上，但要在工地风力允喧昨解决防风磥E┣榭鱿拢厦嬉巡隽舜朔椒ǖ挠诺悖适鞘止ず傅?～3倍，低H，特别是脉冲焊，在平均电流较低的情况下磥E酱笕凵⒛芸刂迫仁淙丒腿恢煤傅某尚巍?</P><br /> <P>　　①此方法的韧性不但被过去的实践证明，本次葛洲坝集团的实验也证明了接头具有良好的冲击韧性。 </P><br /> <P> ②过去，实心焊丝CO2保护焊不被人欢迎的的龙罨个原因是这种方法飞溅大，焊穪E尚筒幻拦郏璞父丛拥龋孀偶际踅剑孀哦怨ひ辗椒ū局实娜鲜逗蜕璞覆欢细慕闷：腹ひ辗椒ǖ奶氐愫蜕璞概浜希扇〉酶丒笮б妗?</P><br /> <P>　　由于气保焊的特点，熔滴过渡有短路、大滴、喷射三种方式初期，三种过渡方式只决定于电弧电压和电流参数，在短路和大滴过渡时，熔滴是非轴向过渡，颗粒又大，所以焊接飞溅很大。而对于CO2气体又很难得到细滴喷射。后来采用了富丒的粊E掀灞；?Ar+20%～25%CO2或Ar+2%～5%C02)，使产生喷射过渡的临界电流大大下降，焊接时飞溅极少，无詠E簦恢煤甘币壮尚巍?</P><br /> </span></td> </tr> </table> <br> <table width="98%" border="0" cellspacing="0" cellpadding="0"> <tr> <td align="center"><b><a href="97949_4.php">上一页</a> <a href="97949_1.php" >1</a> <a href="97949_2.php" >2</a> <a href="97949_3.php" >3</a> <a href="97949_4.php" >4</a> <font class="R">5</font> <a href="97949_6.php" >6</a> <a href="97949_7.php" >7</a> <a href="97949_6.php" >下一页</a> </b></td> </tr> </table> <br>共 7 页 <table align="right" cellpadding="4" cellspacing="0"> <tr> <td class="s" align="right"> 【字体： <a href="javascript:doZoom(16)">磥E/a> <a href="javascript:doZoom(14)">中</a> <a href="javascript:doZoom(12)">小</a>】【 <a href="javascript:window.print()">打印 </a> 】【 <a href="javascript:window.close()">关闭 </a> 】 </td> </tr> </table> <br> <br> </td> </tr> </table> </td> <td width="10" rowspan="2"> </td> </tr> <tr> <td width="199" valign="top" style="border:1px solid #E0CBA7;"> <div align="center"> <script language="javascript" src="/ad/adjc.js"></script> </div> </td> </tr> </table><br> <table width="756" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td class="lm"><font class="gray12"> ■中国机械网提供的资料来自互联网，资料的版权属于作者本人，只供个人学习用，不得非法出版、销售。</font></td> </tr> </table> <br> <table width="756" border="0" align="center" cellpadding="5" cellspacing="1" bgcolor="#95CAFF"> <tr> <td bgcolor="#95CAFF"><table width="700" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td class="M">相关链接</td> </tr> </table></td> </tr> <tr> <td bgcolor="#FFFFFF"> <table width="100%" border="0" align="center" cellpadding="3" cellspacing="0"> <tr> <td class="S" width=50%><span class="LM"> ·<A href="115821.php" target=_blank>国内模具新钢种的开发概縼E/A></span> </td> </tr> <td class="S" width=50%><span class="LM"> ·<A href="115549.php" target=_blank>制作模具需要注意的几个问虂E/A></span> </td> <tr> <td class="S" width=50%><span class="LM"> ·<A href="0605112857.php" target=_blank>460毫米幅窥仙菌灾板校平剪板机自动控制系统</A> (组图)</span> </td> </tr> <td class="S" width=50%><span class="LM"> ·<A href="104187.php" target=_blank>使用维护电控汽车的十个必衼E/A></span> </td> <tr> <td class="S" width=50%><span class="LM"> ·<A href="104092.php" target=_blank>汽车钢板弹簧的润滑</A></span> </td> </tr> <td class="S" width=50%><span class="LM"> ·<A href="103850.php" target=_blank>柴油机使用中的几个误莵E/A></span> </td> <tr> <td class="S" width=50%><span class="LM"> ·<A href="103814.php" target=_blank>发动机润滑油使用中的几个误莵E/A></span> </td> </tr> <td class="S" width=50%><span class="LM"> ·<A href="103787.php" target=_blank>润滑油(脂)使用中易产生的几个误莵E/A></span> </td> <tr> <td class="S" width=50%><span class="LM"> ·<A href="103774.php" target=_blank>用R134a制冷剂替磭\12的几个问虂E/A></span> </td> </tr> <td class="S" width=50%><span class="LM"> ·<A href="103353.php" target=_blank>一部车三个后视镜教你调整汽车后视镜</A></span> </td> </table></td> </tr> </table>  <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <LINK href="../aimage/Style.css" type=text/css rel=stylesheet> <script src="/common/soso.js"></script> </HEAD> <body leftMargin=0 topMargin=0 MARGINWIDTH="0" MARGINHEIGHT="0" bgcolor="white"> <TABLE cellSpacing=0 cellPadding=0 width=756 align=center border=0> <TR bgcolor="#F0F0F0"> <TD width=193 align="left" class="prmleftrightpad s"><a href="/index.php">机械网首页</a> <SPAN class=gray> |</SPAN> <A href="javascript:window.external.AddFavorite('http://www.cnmachines.com','中国机械网')">添加到收藏夹</A></TD> <TD width=563 align=right class=s><a href=/server.php target="_blank">机械网服务</a><SPAN class=gray> |</SPAN> <A href="/useradmin/register.php" target="_blank">免费注册会员</A> <SPAN class=gray> |</SPAN> <A href="/useradmin/dl.php" target="_blank">会员登录</A> </TD> </TR> <TR> <TD width=193 rowspan="2" align="left"><a href="http://www.cnmachines.com"><img src="../image/logo.gif" alt="机械网" name="机械网" width="170" height="40" border="0" id="机械网"></a></TD> <form action="/useradmin/post.php" method="post" > <TD height="26" align="right" vAlign=bottom> 用户名 <input name="username" type="text" size="8" > 密码 <input name="userid" type="password" size="8" > 验证码 <input name="validate" type="text" size="8" > <img src="/common/verify.php?t=gif&w=39&h=19" alt="" width="39" height="19" align="absmiddle" border="0"> <input name="imageField" type="submit" value="提交"> <a href="useradmin/password.php"><b>取回密码</b></a> </TD> </form> </TR> <TR> <TD align="right" vAlign=bottom><TABLE width="500" height="23" border=1 align="right" cellPadding=0 cellSpacing=0 bordercolor="#C2E2F8" bgcolor="#D6ECFA"> <TR> <TD align="center" onmouseover=this.bgColor='#0066ff'; onmouseout=this.bgColor='#D6ECFA'><a href="/shop/shopsearch.php">机械商城</a></TD> <TD align="center" onmouseover=this.bgColor='#0066ff'; onmouseout=this.bgColor='#D6ECFA'><A href="/sort/gq_cate.php" target="_blank">机械商机</A></TD> <TD align="center" onmouseover=this.bgColor='#0066ff'; onmouseout=this.bgColor='#D6ECFA'><a href="/sort/product_cate.php">机械产品</a></TD> <TD align="center" onmouseover=this.bgColor='#0066ff'; onmouseout=this.bgColor='#D6ECFA'><a href="/news.php" target="_blank">机械资讯</a></TD> <TD align="center" onmouseover=this.bgColor='#0066ff'; onmouseout=this.bgColor='#D6ECFA'><a href="/zlh/index.php">机械展会</a></TD> <TD align="center" onmouseover=this.bgColor='#0066ff'; onmouseout=this.bgColor='#D6ECFA'><a href="/sort/company_cate.php" target="_blank">机械黄页</a></TD> <TD align="center" onmouseover=this.bgColor='#0066ff'; onmouseout=this.bgColor='#D6ECFA'><a href="/jxjc/" target="_blank">机械知识</a></TD> </TR> </TABLE></TD> </TR> </TABLE> <TABLE width="756" border=0 align="center" cellPadding=0 cellSpacing=0 class=outborder> <TR background="image/soso.jpg" > <form method="POST" action="" name="mso" onSubmit="return msoubmit()"> <TD height=57 valign="bottom" background="../image/soso.jpg" class="prmleftrightpad s"><input name="pinfo" type="text" class=itm size="48"> <INPUT type=image height=22 width=81 src="../image/so.gif" align=top border=0 name=imageField> <input name="pname" type="hidden" id="pname3"> <br> <input name="item" type="radio" value="c" checked> 商机 <input type="radio" name="item" value="a"> 产品 <input type="radio" name="item" value="h"> 资讯 <input type="radio" name="item" value="d"> 公司 <input type="radio" name="item" value="i"> 商场 <input type="radio" name="item" value="j"> 展会　　　　　　<a href='/gq/query_arry.php?pinfo=ZQ%B4%F3%BC%F5%CB%D9%B1%C8%BC%F5'>ZQ大减速比减</a> <a href='/gq/query_arry.php?pinfo=%C6%BD%B0%E5%BA%E6%B8%C9%BB%FA'>平板烘干机</a> <a href='/product/query_arry.php?pinfo=%BD%C1%B0%E8%BB%FA'>搅拌机</a> <a href='/product/query_arry.php?pinfo=%B1%E2%C6%BD'>扁平</a> </TD> </FORM> </TR> </TABLE> <TABLE width="756" height=2 border=0 align="center"> <TR> <TD height=1></TD> </TR> </TABLE> <TABLE width="756" height=2 border=0 align="center" cellpadding="0" cellspacing="0"> <TR> <TD></TD> </TR> </TABLE> 1 <table width="756" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td align="center"> <script type="text/javascript"></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> </td> </tr> </table> <HR align="center" width="756" color=#ff7300 style="HEIGHT: 3px"> <TABLE width="756" border=0 align="center" cellPadding=0 cellSpacing=5> <TR> <TD align="center" class=s> 版权所有：<a href="http://www.cnmachines.com" target="_blank">机械网</a> 邮件：webmaster@cnmachines.com</TD> </TR> </TABLE> <table width="756" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td align="center"> <script type="text/javascript"></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> </td> </tr> </table> </BODY> </HTML>