Q345钢的CO2气体保护焊的工艺研究..doc

Q345钢的CO2气体保护焊的工艺研究 摘 要 本文以Q345钢的CO2气体保护焊的工艺为例对其进行了分析与研究。 Q345钢综合力学性能良好，低温性能亦可，塑性和焊接性良好，用做中低压容器、油罐、车辆、起重机、矿山机械、电站、桥梁等承受动荷的结构热轧或正火状态使用，可用于-40以下寒冷地区的各种结构二氧化碳气体保护焊已发展成为一种重要的熔焊方法广泛应用于汽车工程机械造船业机车电梯锅炉压力容器制造业，各种金属结构和金属加工机械的生产。：Q345钢，CO2气体保护焊，工艺，焊接缺陷TECHNOLOGY OF STUDY Q345 STEEL BY CO2 GAS WELDING PROTECTION ABSTRACT In this paper, Q345 Steel CO2 gas shielded welding process as an example of its analysis and research. Good mechanical properties of Q345 steel, low temperature performance can, plastic and welding of good, used in low pressure vessels, tanks, vehicles, cranes, mining machinery, power plants, bridges and other structures to withstand dynamic load, mechanical parts, building structures, General metal structure, use of hot-rolled or normalized condition, the following can be used in -40 ℃ cold regions of the various structures. In order to improve efficiency, cost savings, and more use of welding technology. Carbon dioxide gas welding protection has grown to become an important by welding, with low cost, efficient and flexible operating characteristics. It is widely used in the car engine, shipbuilding, construction machinery.The boiler pressure vessel, such as manufacturing, and all sorts of metal and metal processing machinery production. This paper analyzes the Q345 steel welding, followed by CO2 gas shielded welding on the characteristics and processes are analyzed to determine the Q345 steel CO2 gas shielded welding process. Optimization of processing parameters, not only can reduce the welding process of frequently asked questions, and effectively reduce the appearance of weld defects, and can improve production efficiency, saving production cost. KEY WORDS: Q345 steel，CO2 gas shielded welding，elding 目 录 摘 要…………………………………………………...……………………Ⅰ ABSTRACT……………………………………………………..……………Ⅱ 目 录.........................................................................................Ⅲ 前 言……………………………..………………….……………................1 第1章 Q345钢及CO2气体保护焊简介……