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 <p><p><strong><span style="font-family: 宋体;color: rgb(255, 0, 0);letter-spacing: 0;font-size: 21px"><span style="font-family:宋体">因原材料价格波动、型号、收货地址不同，具体报价请联系销售人员</span></span></strong></p><p><strong><span style="font-family: 宋体;color: rgb(255, 0, 0);font-size: 21px"><span style="font-family:宋体">销售热线：</span></span></strong></p><p><strong><span style="font-family: 宋体;color: rgb(255, 0, 0);letter-spacing: 0;font-size: 21px">&nbsp;<img class="lazy-load-other" src="https://img2.fr-trading.com/0/5_692__800_800.jpg.webp?t=" data-original="https://img2.fr-trading.com/0/5_692__800_800.jpg.webp?t="><br/></span></strong></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><strong><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">二保焊机</span></span></strong><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">是简称，全称为</span></span><strong><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">二氧化碳保护焊接机</span></span></strong></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">小功率二保焊机输入电压一般为</span> 220V<span style="font-family:宋体">交流电，大功率用</span><span style="font-family:Arial">380V</span><span style="font-family:宋体">交流电源。输出电压一般</span><span style="font-family:Arial">12--36V</span><span style="font-family:宋体">。 主要用于低碳钢、</span></span><span style="font-family: Arial;letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">低合金高强度钢</span></span><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">，焊接生产*，可进行薄板件及中厚板件焊接。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: 微软雅黑;letter-spacing: 0;font-size: 22px;background: rgb(255, 255, 255)"><span style="font-family:微软雅黑">二保焊机结构</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">二保焊机由变压器、控制电路板、开关、框架等组成，另还有二氧化碳气瓶、线架、送线机等辅助设备共同组成。图片为二保焊机的变压器，由于焊接电流很大，一般都有上百安培，因此其线很粗，大多为铜线圈，也有铝线圈。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: 微软雅黑;letter-spacing: 0;font-size: 22px;background: rgb(255, 255, 255)"><span style="font-family:微软雅黑">二保焊机特点</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">1<span style="font-family:宋体">、操作简单，易引弧、电弧稳定。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">2<span style="font-family:宋体">、电压、电流调节范围大，熔深和焊缝易于控制。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">3<span style="font-family:宋体">、焊接质量好，焊缝抗裂性好，成形美观，焊件变形小，焊后不需清渣。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">4<span style="font-family:宋体">、高效率，比手工电弧焊生产效率提高数倍。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">5<span style="font-family:宋体">、电能消耗小，使用成本低。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">6<span style="font-family:宋体">、多采用风扇强制冷却，散热强，一般有过载保护、过压、欠压保护、缺相保护、输出过电流保护等，许多采用</span><span style="font-family:Arial">IGBT</span><span style="font-family:宋体">逆变技术，性能稳定。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">7<span style="font-family:宋体">、调节方便，通过调节送丝速度等，可实现连续焊接、点焊、间隙点焊、自锁焊等，是一种多功能的焊接设备。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">8<span style="font-family:宋体">、 适用于低碳钢、低合金高强度钢、大型钢结构工程焊接，其焊接生产*，抗裂性能好，焊接变形小，适应变形范围大，可进行薄板件及中厚板件焊接。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">9<span style="font-family:宋体">、 所用保护气体为二氧化碳，价格低廉，焊缝成形良好。加上使用含脱氧剂的焊丝即可获得无内部缺陷的质量焊接接头，因此已成为钢材最重要的大批量焊接方法。</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体纯度为</span><span style="font-family:Arial">99.5%;</span><span style="font-family:宋体">含水量不超过</span><span style="font-family:Arial">0.1%;</span><span style="font-family:宋体">含碳量不超过</span><span style="font-family:Arial">0.1%</span><span style="font-family:宋体">。提前送气时间一般 </span><span style="font-family:Arial">0.5s</span><span style="font-family:宋体">，滞后关气时间一般 </span><span style="font-family:Arial">5s</span><span style="font-family:宋体">。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: 微软雅黑;letter-spacing: 0;font-size: 22px;background: rgb(255, 255, 255)"><span style="font-family:微软雅黑">二保焊机的焊接特点</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(1)<span style="font-family:宋体">森达焊接二保焊机焊接成本低 </span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体是酿造厂和化工厂的副产品，来源广，价格低，其综合成本大概是手工电弧焊的</span><span style="font-family:Arial">1/2</span><span style="font-family:宋体">。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(2)<span style="font-family:宋体">生产效* </span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体保护焊使用较大的电流密度</span><span style="font-family:Arial">(200A/mm2</span><span style="font-family:宋体">左右</span><span style="font-family:Arial">)</span><span style="font-family:宋体">，比手工电弧焊</span><span style="font-family:Arial">(10-20A/mm2</span><span style="font-family:宋体">左右</span><span style="font-family:Arial">)</span><span style="font-family:宋体">高得多，因此熔深比手弧焊高</span><span style="font-family:Arial">2.2-3.8</span><span style="font-family:宋体">倍，对</span><span style="font-family:Arial">10mm</span><span style="font-family:宋体">以下的钢板可以不开坡口，对于厚板可以减少坡口加大钝边进行焊接，同时具有焊丝熔化快，不用清理熔渣等特点，效率可比手弧焊提高</span><span style="font-family:Arial">2.5-4</span><span style="font-family:宋体">倍。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(3)<span style="font-family:宋体">焊后变形小</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体保护焊的电弧热量集中，加热面积小，</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气流有冷却作用，因此焊件焊后变形小，特别是薄板的焊接更为突出。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(4)<span style="font-family:宋体">抗锈能力强 </span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体保护和埋弧焊相比，具有较高的抗锈能力，所以焊前对焊件表面的清洁工作要求不高，可以节省生产中大量的辅助时间。缺点</span><span style="font-family:Arial">:</span><span style="font-family:宋体">由于</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体本身具有较强的氧化性，因此在焊接过程中会引起合金元素烧损，产生气孔和引起较强的飞溅，特别是飞溅问题，虽然从焊接电源、焊丝材料和焊接工艺上采取了一定的措施，但至今未能完全消除，这是</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">焊的明显不足之处。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: 微软雅黑;letter-spacing: 0;font-size: 22px;background: rgb(255, 255, 255)"><span style="font-family:微软雅黑">二保焊机的分类</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">CO2<span style="font-family:宋体">气体保护焊按操作方法，可分为自动焊及半自动焊两种。对于较长的直线焊缝和规则的曲线焊缝，可采用自动焊</span><span style="font-family:Arial">;</span><span style="font-family:宋体">对于不规则的或较短的焊缝，则采用半自动焊，目前生产上应用最多的是半自动焊。</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体保护焊按照焊丝直径可分为细丝焊和粗丝焊两种。森达焊接推荐细丝焊采用直径小于</span><span style="font-family:Arial">1.6mm,</span><span style="font-family:宋体">工艺上比较成熟，适宜于薄板焊接</span><span style="font-family:Arial">;</span><span style="font-family:宋体">粗丝焊采用的直径大于或等于</span><span style="font-family:Arial">1.6mm</span><span style="font-family:宋体">，适用于中厚板的焊接。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: 微软雅黑;letter-spacing: 0;font-size: 22px;background: rgb(255, 255, 255)"><span style="font-family:微软雅黑">二保焊机的熔滴过渡</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">在常用的焊接工艺参数内，</span>CO2<span style="font-family:宋体">气体保护焊的熔滴过渡形式有两种，即细颗粒过渡和短路过渡。 </span><span style="font-family:Arial">(1)</span><span style="font-family:宋体">细颗粒状过渡 </span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体保护焊采用大电流，高电压进行焊接时，熔滴呈颗粒状过渡。当颗粒尺寸增加时，会使焊缝成型恶化，飞溅加大，并使电弧不稳定。因此常用的是细颗粒状过渡，此时熔滴直径约比焊丝直径小</span><span style="font-family:Arial">2-3</span><span style="font-family:宋体">倍。特点，电流大、直流反接。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(2)&nbsp;</span><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">短路过渡</span> CO2<span style="font-family:宋体">气体保护焊采用小电流，低电压焊接时，熔滴呈短路过渡。短路过渡时，熔滴细小而过渡频*</span><span style="font-family:Arial">(</span><span style="font-family:宋体">一般在</span><span style="font-family:Arial">250-300l/s),</span><span style="font-family:宋体">此时焊缝成形美观，适宜于焊接薄件。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;text-indent:22px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: 微软雅黑;letter-spacing: 0;font-size: 22px;background: rgb(255, 255, 255)"><span style="font-family:微软雅黑">二保焊机的冶金特点</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(1)CO2<span style="font-family:宋体">气体的氧化性</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体是氧化性气体，在电弧高温作用下会发生分解</span><span style="font-family:Arial">:CO2=CO+0 </span><span style="font-family:宋体">在电弧区中，约有</span><span style="font-family:Arial">40-60%</span><span style="font-family:宋体">的</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体被分解，分解出来的原子态氧具有强烈的氧化性。使碳和其它合金元素如</span><span style="font-family:Arial">Mn</span><span style="font-family:宋体">、</span><span style="font-family:Arial">Si</span><span style="font-family:宋体">被大量氧化，结果使焊缝金属的机械性能大大下降。</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">焊常用的脱氧措施是在焊丝中加入脱氧剂，常用的脱氧剂是</span><span style="font-family:Arial">Al</span><span style="font-family:宋体">、</span><span style="font-family:Arial">Ti</span><span style="font-family:宋体">、</span><span style="font-family:Arial">Si</span><span style="font-family:宋体">、</span><span style="font-family:Arial">Mn</span><span style="font-family:宋体">，而其中尤以</span><span style="font-family:Arial">Si</span><span style="font-family:宋体">、</span><span style="font-family:Arial">Mn</span><span style="font-family:宋体">用得最多。森达焊接分析在上述脱氧剂中单独使用任一种脱氧剂效果均不理想，所以通常采用</span><span style="font-family:Arial">Si</span><span style="font-family:宋体">、</span><span style="font-family:Arial">Mn</span><span style="font-family:宋体">联合脱氧。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(2)<span style="font-family:宋体">气孔 </span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体保护焊时，如果使用化学成份不合要求的焊丝、纯度不合要求的</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体及不正确的焊接工艺，由于</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气流有一定的冷却作用，熔池凝固较快，很容易在焊缝中产生气孔。</span><span style="font-family:Arial">……</span><span style="font-family:宋体">实践表明，在</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体保护焊中，采用</span><span style="font-family:Arial">ER50-6(</span><span style="font-family:宋体">原为</span><span style="font-family:Arial">H08Mn2SiA)</span><span style="font-family:宋体">等含有脱氧剂的焊丝焊接低碳钢、低合金钢时，如果焊前对焊丝和钢板表面的油污、铁锈作了适当的清理，</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体中的水分也比较少的情况下，焊缝金属中产生的气孔主要是氮气孔。而氮来自空气的侵入，因此在焊接过程中保护气层稳定可靠是防止焊缝中产生氮气孔的关键。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: 微软雅黑;letter-spacing: 0;font-size: 22px;background: rgb(255, 255, 255)"><span style="font-family:微软雅黑">二保焊机的工艺参数</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)"><span style="font-family:宋体">用二保焊机进行焊接时，由于熔滴过渡的不同形式，需采用不同的焊接工艺参数</span></span><span style="font-family: Arial;color: rgb(51, 102, 204);letter-spacing: 0;font-size: 12px;background: rgb(255, 255, 255)">[1]</span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">(1)<span style="font-family:宋体">短路过渡时的工艺参数 短路过渡焊接采用细丝焊，常用焊丝直径为</span><span style="font-family:Arial">Φ0.6~1.2</span><span style="font-family:宋体">，随着焊丝直径增大，飞溅颗粒都相应增大。短路过渡焊接时，主要的焊接工艺参数有电弧电压、焊接电流、焊接速度，气体流量及纯度，焊丝深出长度。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">1) <span style="font-family:宋体">电弧电压及焊接电流 电弧电压是短路过渡时的关键参数，短路过渡的特点是采用低电压。电弧电压与焊接电流相匹配，可以获得飞溅小，焊缝成形良好的稳定焊接过程。</span><span style="font-family:Arial">Φ1.2</span><span style="font-family:宋体">的一般参数为 电压 </span><span style="font-family:Arial">19</span><span style="font-family:宋体">伏</span><span style="font-family:Arial">;</span><span style="font-family:宋体">电流</span><span style="font-family:Arial">120~135</span><span style="font-family:宋体">。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">2)<span style="font-family:宋体">焊接速度随着焊接速度的增加，焊缝熔宽、熔深和余高均减小。焊速过高，容易产生咬边和未焊透等缺陷，同时气体保护效果变坏，易产生气孔。焊接速度过低，易产生烧穿，组织粗大等缺陷，并且变形增大，生产效率降低。因此，应根据生产实践对焊接速度进行正确的选择。通常半自动焊的速度不超过</span><span style="font-family:Arial">0.5m/min,</span><span style="font-family:宋体">自动焊的速度不超过</span><span style="font-family:Arial">1.5m/min</span><span style="font-family:宋体">。</span></span></p><p style="margin-top:0;margin-right:0;margin-bottom:15px;margin-left:0;text-indent:28px;padding:0 0 0 0 ;line-height:24px"><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">3) <span style="font-family:宋体">气体的流量及纯度 气体流量过小时，保护气体的挺度不足，焊缝容易产生气孔等缺陷</span><span style="font-family:Arial">;</span><span style="font-family:宋体">气体流量过大时，不仅浪费气体，而且氧化性增强，焊缝表面上会形成一层暗灰色的氧化皮，使焊缝质量下降。为*焊接区免受空气的污染，当焊接电流大或焊接速度快，焊丝伸出长度较长以及室外焊接时，应增大气体流量。通常细丝焊接时，气体流量在</span><span style="font-family:Arial">15~25L/min</span><span style="font-family:宋体">之间。</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体的纯度不得低于</span><span style="font-family:Arial">99.5%</span><span style="font-family:宋体">。同时，当气瓶内的压力低于</span><span style="font-family:Arial">1Mpa,</span><span style="font-family:宋体">就应停止使用，以免产生气孔。这是因为气瓶内压力降低时，溶于液态</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">中的水分汽化量也随之增大，从而混入</span><span style="font-family:Arial">CO2</span><span style="font-family:宋体">气体中的水蒸气就越多。</span></span></p><p><span style="font-family: Arial;color: rgb(51, 51, 51);letter-spacing: 0;font-size: 14px;background: rgb(255, 255, 255)">4) <span style="font-family:宋体">焊丝伸出长度 由于短路过渡均采用细焊丝，所以焊丝伸出长度上所产生的电阻热影响很大。伸出长度增加，焊丝上的电阻热增加，焊丝熔化加快，生产率提高。但伸出长度过大时，焊丝容易发生过热而成段熔断，飞溅严重，焊接过程不稳定。同时伸出增大后，喷嘴与焊件间的距离亦增大，因此气</span></span></p><p><strong><span style="font-family: 宋体;color: rgb(255, 0, 0);letter-spacing: 0;font-size: 21px"><img class="lazy-load-other" 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