摘要开发和利用海洋资源是解决人类自然资源危机的有效手段，水下施工技术的进步推动着人类海洋开发的前进步伐。近年来我国水下焊接技术得到了飞速发展，研发及施工应用都有了较大的提高，然而同等重要的水下切割技术却未得到明显的进步，亟需发展。本文提出了一种利用产热带促进切割的新型水下药芯电弧切割技术。此次实验进行了水下药芯电弧切割工艺实验，研究了水下药芯电弧切割的工艺参数及产热带对割口成形的影响；分析了割口热影响区的显微组织及显微硬度；对比了国内自制割丝与国外进口割丝在相同实验条件下切割电流的稳定性。实验结果表明：影响切割质量的主要因素是由切割电流、电弧电压以及切割速度三者的合理搭配与优化决定的；在其他切割参数一定时，随着切割速度的增加，钢板会出现一系列切割缺陷；使用国内自制割丝配合自主研发的产热带获得的切割质量优于国外进口割丝。86464

毕业论文关键词：水下药芯电弧切割；表面处理；割口显微组织；割口显微硬度

Abstract The development and utilization of marine resources is an effective means to solve the crisis of human natural resources, and the progress of underwater construction technology pushes forward the pace of human development for ocean。 In recent years, the development of underwater welding technology of our country has been raised rapidly, the research and applied construction have been greatly improved。 However, the same important underwater cutting technology has not been thought highly of, it need to be developed urgently。 This paper presents a new cutting technology named underwater flux cored arc cutting which uses a kind of coating for heat production to promote cutting efficiency。 The experiment conducted underwater flux cored arc cutting test。 The effects of processing parameters of underwater flux cored arc cutting and coating for heat production on cutting forming has been researched。 The microstructure and micro hardness of the heat affected zone of the cutting are analyzed。 The stability of cutting current of domestic flux cored wire and imported wire under the same experimental conditions was compared。 The experimental results show that the main factors which influence the cutting quality are distributed and decided reasonably by cutting current, arc voltage and cutting speed; In a certain cutting parameters, with the increase of cutting speed, steel plate will appear a series of cutting defects。 The cutting quality obtained by using domestic cut wire with coating for heat production is higher than the imported, which coating is produced independently。

Key words: Underwater flux cored arc cutting; Surface treatment; Cutting microstructure; Cutting micro hardness。

目录

第一章 绪论 1

1。1 本课题的研究背景 1

1。2 水下切割技术的特点 1

1。3 水下切割技术的分类 2

1。3。1 水下氧-火焰切割技术 3

1。3。2 水下电弧-氧切割技术 4

1。3。3 水下等离子弧切割 4

1。3。4 熔化极水射流切割 5

1。3。5 热割矛水下切割 5

1。3。6 V型聚能容器爆炸切割 5

1。3。7 高压水射流切割 6

1。3。8 水下机械切割 6

1。4 水下药芯电弧切割 6

1。4。1 水下药芯电弧切割过程