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Old 04-27-2011, 02:58 AM   #1
qdsk55lmtv
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Default |清大圣科气化炉反骗子.|低碳钢焊接接头的组成、区域

过热区 紧靠着熔合区,加热温度约为1 100~1 490°C××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&t imes;www.qhsk.cn×清大圣科科技有限公司×× 由于温度大大超过Ac3,奥氏体晶粒急剧长大,形成过热组织,使塑性大大降低,冲击韧性值下降25%~75 %左右××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×w ww.qhsk.cn×清大圣科科技有限公司××

低碳钢的热影响区分为熔合区、过热区、正火区和部分相变区××清大圣科&time s;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×清大圣科科技有限公 司××

热影响区:在焊接过程中,焊缝两侧金属因焊接热作用而产生组织和性能变化的区域×&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××

部分相变区 加热温度约为727~850°C××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× × 只有部分组织发生转变,冷却后组织不均匀,力学性能较差××清大圣科&times ;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×清大圣科科技有限公司 ××
熔合区 位于焊缝与基本金属之间,部分金属焙化部分未熔,也称半熔化区××清大圣科&ti mes;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×清大圣科科技有 限公司×× 加热温度约为1 490~1 530°C,此区成分及组织极不均匀,强度下降,塑性很差,是产生裂纹及局部脆性破坏的发源地&t imes;×清大圣科×清大圣科电焊条×清大圣科电焊条设备&tim es;清大金桥×清大金桥电焊条设备×清大圣科气化炉×www.qh sk.cn×清大圣科科技有限公司××

正火区 加热温度约为850~1 100°C,属于正常的正火加热温度范围××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;× 冷却后得到均匀细小的铁素体和珠光体组织,其力学性能优于母材××清大圣科&ti mes;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×清大圣科科技有 限公司××

由于焊条芯及药皮在焊接过程中具有合金化作用,焊缝金属的化学成分往往优于母材,只要焊条和焊接工艺参数选 择合理,焊缝金属的强度一般不低于母材强度××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&time s;清大圣科气化炉×www.qhsk.cn×清大圣科科技有限公司&times ;×

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