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Old 06-11-2008, 10:37 PM   #1
bcde714
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阴茎

You write very well, support you!
















阴茎短小
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Old 07-13-2008, 09:56 PM   #2
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Arrow 新加的空白文章1

这是新加的空白文章1,可以在UBB可视化编辑器中,添加和修改文章内容。
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Old 08-05-2008, 06:21 AM   #3
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Lightbulb 放热焊接

东营科特开发的科特威放热焊接系列产品具有国内领先水平,达到或超过了国外同类产品的技术性能,科特威放热焊接产品已经广泛的应用在阴极保护、电力接地、铁路等行业。
1、 防雷接地放热焊热熔焊接工艺介绍
http://www.cadweld.cn东&#3382...#27169;具
放热焊接也称“铝热焊接、火泥熔接、热熔焊接”,是一种铝还原另一种金属氧化物(通常是铜或铁的氧化物)这样一个放热反应(铝热焊反应)生成熔融的铜或铁来实现焊接的工艺。
放热焊接化学反应速度非常快,仅几秒就可以完成焊接,产生热量极高可以有效的传导至熔接部位,使其熔为一体,形成分子结合。它无须其他任何热能,若用于接地线路金属导体的连接是最好的方法。(注:IEEE std.80-1976早已推举放热熔接法为接地线路的最好方法)。
放热焊接主要可焊接纯铜、黄铜、青铜、紫铜、铜包钢、纯铁、不锈钢、锻铁、镀锌钢铁、铸铁等
2、防雷接地放热焊热熔焊接的特点和优点
http://www.cadweld.cn东&#3382...#20855;。
1. 焊接点的载流能力与导线的载流能力相等,不会增加电阻率;
2. 连接点是永久性的。因为是分子结合,没有机械性压力,不会松驰或腐蚀、不会老化。
3. 焊接点像铜一样,而比铜本身更加坚韧,抗张力强于导线,且不受腐蚀性产物的影响;
4. 焊接点能经受反复多次的大浪涌(故障)电流而不退化;
5. 焊接方法简单,培训容易,无需特定焊接工人,节省成本;
6. 供焊接用的材料很轻,易于学习掌握,携带方便;
7. 进行焊接时,无需依靠外接电源或热源,只需配合模具便可,室内野外均可独立焊接作业;
8. 从外观便能核查焊接的质量;
9. 模具轻便,易于携带,适合于任何场合熔接作业。
10. 焊接速度快,仅几秒就可完成,对绝缘体和导体破坏影响小。
11. 可用于焊接铜、铜合金、镀铜钢、各种合金钢包括不锈钢及高阻加热热源材料。
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Old 09-03-2008, 10:30 AM   #4
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really??
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