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Old 05-13-2011, 10:03 AM   #1
qdsk84pdyq
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Default |清大圣科气化炉反骗子.|手工电弧焊工艺操作方法、中

起头焊缝是指刚开始焊接的部分,应该在引弧后先将电弧稍拉长,对焊缝端头进行必要的预热,然后适当缩短弧长 进行正常焊接××清大圣科×清大圣科电焊条×清大圣科电 焊条设备×清大金桥×清大金桥电焊条设备×清大圣科气化炉&time s;www.qhsk.cn×清大圣科科技有限公司××
由于药皮容易受潮,受潮后的焊条工艺性能变坏,而且水分中的氢容易使焊缝产生气孔和裂纹,故焊条使用前必须 烘干,以降低焊条的含氢量,一般采用350~450º,保温1~2小时,烘干×&t imes;清大圣科×清大圣科电焊条×清大圣科电焊条设备×清大金桥 ×清大金桥电焊条设备×清大圣科气化炉×www.qhsk.cn&t imes;清大圣科科技有限公司××

接头由于受焊条长度的限制,有时不能用一根焊条完成一条焊缝,要求先焊的焊缝起头处略低一些,接头时在先焊 焊缝的起头稍前处引弧,并稍微拉长电弧将电弧引向起头处,并覆盖前焊缝的端头处,待起头处焊缝焊平后再沿焊 接方向移动××清大圣科×清大圣科电焊条×清大圣科电焊 条设备×清大金桥×清大金桥电焊条设备×清大圣科气化炉&times ;www.qhsk.cn×清大圣科科技有限公司××

焊接厚度 第一层焊缝 其它各层焊缝××清大圣科×清大圣科电焊条×清大圣科电 焊条设备×清大金桥×清大金桥电焊条设备×清大圣科气化炉&time s;www.qhsk.cn×清大圣科科技有限公司××焊条直径 焊接电流(A) 焊条直径 焊接电流(A)≥6 4 160~210 4 160~2105220~280
焊第二层时,先将第一层熔渣除净,然后用直径较大的焊条和较大的焊接电流进行焊接×&time s;清大圣科×清大圣科电焊条×清大圣科电焊条设备×清大金桥&ti mes;清大金桥电焊条设备×清大圣科气化炉×www.qhsk.cn&time s;清大圣科科技有限公司×× 为了保证质量和防止变形,应使层与层之间的焊接方向相反,焊缝接头也应相互错开×&times ;清大圣科×清大圣科电焊条×清大圣科电焊条设备×清大金桥&tim es;清大金桥电焊条设备×清大圣科气化炉×www.qhsk.cn&times ;清大圣科科技有限公司××
焊缝收尾是指一条焊缝焊完时,应把收尾处的弧坑填满,如果收尾时立即拉断电弧,会形成低于焊件表面的弧坑, 过深使焊缝收尾处强度减弱,导致产生裂纹××清大圣科×清大圣科电焊 条×清大圣科电焊条设备×清大金桥×清大金桥电焊条设备&times ;清大圣科气化炉×www.qhsk.cn×清大圣科科技有限公司× × 因此在收尾时不允许有弧坑存在,应将弧坑填满为止××清大圣科×清大 圣科电焊条×清大圣科电焊条设备×清大金桥×清大金桥电焊条设备&t imes;清大圣科气化炉×www.qhsk.cn×清大圣科科技有限公司&ti mes;×

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