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<h1 class="chanpT">镀锌钢板用什么方法焊接较好？</h1>
<div class="chanpTime">发布时间:2023-02-23</div>
<div class="chanpC"><p>镀锌钢焊接工艺(1)手工电弧焊1)为减少焊接烟尘，防止焊接裂纹和气孔，除适当的坡口外，还应去除坡口附近的锌层。可用于去除火焰烘烤或喷砂。坡口间隙应尽可能控制在1.5～2mm当工件厚度较大时，可放宽至2.5～3mm。2)焊条的选择原理是焊缝金属的力学性能尽可能与母材相似，焊条熔化金属的硅含量应控制在0.2％以下。钛铁矿焊条、氧化钛焊条、纤维素焊条、钛钙焊条、低氢焊条的接头强度可达到满意指标，但低氢焊条和纤维素焊条的焊缝容易产生夹渣和气孔，一般不使用。低碳钢镀锌钢板应优先考虑J421/J422或J423焊条。强度等级为5000MPa可选用上述镀锌钢板E5001、E5003等型号的焊条。对于强度在600MPa应选用上述镀锌钢板E6013、E5503及E5513型号的焊条。焊接时，尽量使用短弧，不要摆动电弧，防止镀锌层熔化区扩大，保证工件的耐腐蚀性，减少烟尘量。</p><p>(2)熔化极气体保护焊可采用CO气体保护焊或Ar CO2、Ar O焊接混合气体保护焊等。在焊缝中保护气体Zn含量有明显影响，使用纯度CO2或CO2 O2时，焊缝中Zn而且使用含量高Ar CO2或Ar O2时，焊缝中Zn含量低。焊缝中的电流Zn含量影响不大。随着焊接电流的增加，焊缝Zn含量略有下降。镀锌钢采用气体保护焊接时，焊接烟尘远大于手工电弧焊，应特别注意排气。影响烟尘量和成分的主要因素是电流和气体保护。电流越大，或保护气体CO2或O2含量越大，焊接烟尘越大，烟尘中ZnO含量也较大限度地增加ZnO含量可达70%左右。镀锌钢的熔深大于非镀锌钢板。T焊孔敏感性大，焊接速度越大，对镀锌合金钢的焊接速度影响尤为明显。多道焊时，后续焊道的气孔敏感性大于前一道。镀锌钢接头机械性能见表2。可见，保护气体成分对接头的力学性能影响不大，一般采用纯化CO2进行焊接。表3~表5分别给出了镀锌钢板I形对接接头、搭接接头和T形接头的短路过渡CO焊接工艺参数2。表3镀锌钢板I形对接接头CO2焊接规范参数</p><p>表4镀锌钢板搭接接接头CO2焊接规范参数 </p><p>表5镀锌钢板T形接头(角接头)CO2焊接规范参数</p><p></p></div>
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