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盾构机刀具修复专用耐磨堆焊药芯焊丝的开发

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发表于 2018-7-18 15:41:05 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
  地铁隧道施工时,盾构机刀具受到强烈的冲击和高应力的磨粒磨损,这是造成刀具迅速失效的主要原因。刀具的失效主要是刃口上镶嵌的硬质合金?#32784;?#33853;和折断。刀具作为盾构机的主要损耗件之一,全部?#35272;到?#21475;,不但造价昂贵,运输耗时、耗资,对地铁施工的进程造成了很大的影响,而且频繁更换刀具使得开仓?#38382;?#22686;加,加大了塌方危险发生的可能性。因此,开展盾构机刀具的修复?#33455;俊?#36827;而实现国产化显得尤为必要。
  ?#26412;?#22266;本KB600耐磨焊丝是针对盾构机刀具修复开发的一种堆焊药芯焊丝,?#26412;?#20026;1.6mm,采用CO2气体保护焊。KB600耐磨焊丝具有良好的焊接工?#25307;阅埽?#22534;焊层焊态硬度可达62 HRC,堆焊层无裂纹,而且可以满足盾构机刀具现场修复时苛刻的施焊要求:不能进行焊前预?#32676;?#28938;后热处理、施焊空间?#21015; ?#36890;风条件差?#21462;?br />   ?#26412;?#22266;本KB600耐磨焊丝具有良好的焊接工?#25307;阅埽?#33021;够满足盾构机刀具修复和制造的施焊要求。堆焊层具有?#32454;?#30340;焊态硬度,其显微组织为断续网状的奥氏体和低碳马氏体,具有良好的加工硬化?#38405;?#21644;耐磨粒磨损?#38405;堋?br />
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