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<td align="right" width="60%"><span class="JQ">D707</span></td>
<td style="padding-left:1em;vertical-align:middle;" width="40%">符合 GB EDW-A-15<br />
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<p><br />
<strong>说明:</strong> 采用碳钢为焊芯的低氢钠型药皮碳化钨堆焊焊条,依靠药皮中碳化物合金过渡,堆焊金属含钨量80-85%,由于药皮较厚,合金元素多,可交直流焊接接,使用适当的电流堆焊。</p>
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<p><br />
<strong>用途:</strong> 用于堆焊耐岩石强烈磨损之机械零件,如混凝土搅拌机叶片、推土机和泵浦叶片、挖泥机叶片、高速混砂箱 机械设备等。</p>
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<td class="Metal" colspan="2"><strong><br />
熔敷金属化学成分(%)</strong> <table class="ke-zeroborder" bordercolor="#d4d0c8" cellspacing="1" width="100%" bgcolor="#000000" border="0">
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<div align="center">化学成分 </div>
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<td height="20">
<div align="center">C</div>
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<td height="20">
<div align="center">Mn</div>
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<td height="20">
<div align="center">Si</div>
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<td height="20">
<div align="center">W</div>
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<div align="center">保证值</div>
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<div align="center">1.50~3.00</div>
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<div align="center">≤2.00</div>
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<div align="center">≤4.00</div>
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<div align="center">80.0~85.0</div>
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<td colspan="2"><strong><br />
</strong><strong>堆焊层硬度:</strong> HRC≥85</td>
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<td colspan="2"><strong><br />
</strong><strong>参考电流</strong> (DC+) <table class="ke-zeroborder" bordercolor="#d4d0c8" cellspacing="1" width="100%" bgcolor="#000000" border="0">
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<div align="center">焊条直径(mm) </div>
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<td valign="bottom" height="20">
<div align="center">φ3.2</div>
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<td valign="bottom" height="20">
<div align="center">φ4.0</div>
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<td valign="bottom" height="20">
<div align="center">φ5.0</div>
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<div align="center">焊接电流(A) </div>
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<div align="center">70~120</div>
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<div align="center">140~180</div>
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<div align="center">180~220</div>
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<td valign="top" colspan="2"><br />
<strong>注意事项</strong>:<br />
1.焊前焊条须经300-350℃烘焙1h。<br />
2.堆焊件为碳钢时预热温度在300℃以上,堆焊件为低合金钢时预热温度为400-500℃,堆焊件为不锈钢时预热温度为600-650℃。<br />
3.低合金钢及不锈钢焊后须经700℃退火。<br />
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