选煤厂刮板堆焊修复的工艺设计-毕业论文

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新疆工程学院毕业论文（设计）

摘要

本文针对选煤厂刮板由于经常在煤堆里面使用，其表面易受磨损，而由于

磨损导致的残缺致使刮板失效对工程影响较大。利用药芯焊丝对已磨损的 K360

耐磨钢进行 CO2 气体保护堆焊修复,并对堆焊层进行了显微组织、X 射线衍射、

硬度、冲击韧度及抗磨料磨损性能试验。结果表明:堆焊层的组织为细小板条马

氏体+ 少量弥散分布碳化物,硬度不高,产生冷裂纹倾向小,韧性与塑性较高;同

时堆焊层组织细小,弥散分布的碳化物对焊层基体有强化作用,使堆焊层的耐磨

性达到了基体的水平。

关键词：MAG 焊接工艺；堆焊层加强；选煤厂刮板；耐磨堆焊

第 1 页

新疆工程学院毕业论文（设计）

ABSTRACT

In this paper, the scraper in coal preparation plant is often

used in the coal pile, its surface is vulnerable to wear, and the

scraping failure caused by wear has a great impact on the project.

The worn K360 wear-resistant steel was repaired by CO2 gas shielded

surfacing with flux cored wire. The microstructure, X-ray

diffraction, hardness, impact toughness and abrasive wear resistance

of the surfacing layer were tested. The results show that the

microstructure of the surfacing layer is fine lath martensite + a

small amount of dispersed carbides, with low hardness, small tendency

to produce cold cracks and high toughness and plasticity; meanwhile,

the microstructure of the surfacing layer is fine, and the dispersed

carbides can strengthen the substrate of the surfacing layer, so that

the wear resistance of the surfacing layer reaches the level of the

substrate.

Key words: MAG welding process; hardfacing layer strengthening;

scraper in coal preparation plant; hardfacing

第 2 页

新疆工程学院毕业论文（设计）
目录
摘要................................................................................................................................................ 1
ABSTRACT....................................................................................................................................... 3
第1章 绪论.................................................................................................................................... 6
1.1 本课题选题依据及意义...............................................................................................................6
1.2 课题研究概括以及发展趋势.......................................................................................................7
1.3 本课题研究的主要内容.............................................................................................................9
第2章 实验材料........................................................................................................................... 11
2.1 K360 钢的化学成分及力学性能................................................................................................11
2.2 K360 钢的焊接分析....................................................................................................................11
2.3 K360 钢的焊接试验方法............................................................................................................12
2.4 堆焊焊丝及保护气体的选择.....................................................................................................12
3 实验设备.................................................................................................................................... 14
3.1 焊机............................................................................................................................................ 14
3.2 实验所需的其他设备.................................................................................................................14
4 堆焊工艺设计............................................................................................................................ 15
4.1 实验方法.....................................................................................................................................15
4.2 实验方案.....................................................................................................................................15
4.3 堆焊强化工艺参数.....................................................................................................................15
5 实验结果分析............................................................................................................................ 16
5.1 金相试样的制备......................................................................................................................... 16
5.2 磨损试验分析.............................................................................................................................16
5.3 显微硬度分析.............................................................................................................................16
5.3 工艺参数对宏观形貌的影响.....................................................................................................16
5.4 堆焊层微观组织观察.................................................................................................................16
6 经济成本分析............................................................................................................................ 17
结论.............................................................................................................................................. 18
参考文献....................................................................................................................................... 19
致谢.........................................................................................................................................................20
第 3 页 

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摘要：

新疆工程学院毕业论文（设计）摘要本文针对选煤厂刮板由于经常在煤堆里面使用，其表面易受磨损，而由于磨损导致的残缺致使刮板失效对工程影响较大。利用药芯焊丝对已磨损的K360耐磨钢进行CO2气体保护堆焊修复,并对堆焊层进行了显微组织、X射线衍射、硬度、冲击韧度及抗磨料磨损性能试验。结果表明:堆焊层的组织为细小板条马氏体+少量弥散分布碳化物,硬度不高,产生冷裂纹倾向小,韧性与塑性较高;同时堆焊层组织细小,弥散分布的碳化物对焊层基体有强化作用,使堆焊层的耐磨性达到了基体的水平。关键词：MAG焊接工艺；堆焊层加强；选煤厂刮板；耐磨堆焊第1页新疆工程学院毕业论文（设计）ABSTRACTInthispaper...

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