Control of the welding process and shortcomings: Xu Xiaoping Editor Published: 2013 Introduction "professional vocational welding engineering planning materials combined series: welding process control and defect" in conjunction with the construction and quality control during the construction of the steel structure engineering experience , Mainly teaches the thermal cycling of metals in the welding process, the changes in the structure and performance of welded joints; the causes of common welding metallurgy defects, influencing factors and preventive measures. The book is divided into five modules of knowledge and ability, including: characteristics and control of fusion welding metallurgy process, welding joint organization and performance control, generation and control of pores in the weld, hazards and control of inclusions in the weld, and cracks in the weld joint. Generate and control. A series of planning textbooks for the welding of engineering and learning in higher vocational and technical colleges: fusion welding process and lack of control. In the process of writing, starting from the vocational training ability of higher vocational talents, the practical content of the teaching content was particularly emphasized, especially in combination with the characteristics of welding professional and technical positions. Try to combine the actual organization content of production to enable students to master the basic knowledge and ability of metal fusion welding process and quality control. "Combination of Engineering and Learning Planning Teaching Materials for Welding Specialty in Higher Vocational Colleges: Welding Process and Lack Control" breaks the conventional writing mode, and integrates the skills and knowledge required by welding students to control the quality of the welding process into modules. The basic rules are based on the welding work process and related project tasks. Each chapter begins with a "learning goal" and ends with an "expert call." This book also takes into account the test points for welder certification to meet the teaching needs of the "dual certification system."
Introduction Introduction Introduction Chapter 1 Features and Control Learning Goals of Welding Metallurgy Process Section 1 Selection of Welding Heat Sources 1. Common Welding Heat Sources 2. Main Features of Welding Heat Sources 3. Thermal Efficiency of Welding Processes 4. Heat of Welding Processes Input V. Selection of welding heat source Experts point out Section 2. Welding heat cycle adjustment 1. Basic concepts of welding heat cycle 2. Basic parameters of welding heat cycle 3. Adjustment of welding heat cycle for multilayer welding 4. Influence of welding heat cycle Factors and adjustment methods Experts point out Section III Protection during the formation of welding seam 1. Heating and melting of welding rod 2. Melting and melting pool of base metal 3. Control of fusion ratio of welding metal 4. Welding slag 5. Welding chemistry Metallurgical process.
Sixth, the relationship between welding parameters and welding chemistry metallurgy Expert dialing operation and training Chapter II Welding joint organization and performance control Learning objectives Section 1 Solidification and solid phase transformation control of the molten pool metal I. Characteristics of the primary crystallization of the weld pool II 1. Control of weld metal primary structure 3. Control of weld metal secondary organization 4. Experts on alloying of weld metal call Section 2. Quality analysis of welding fusion zone 1. Formation of fusion zone 2. Characteristics and performance analysis of fusion zone Section III Control of Welding HAZ Structure and Mechanical Properties I. Organization of Welding HAZ and Its Change Characteristics II. Experts' Dialing Work and Training of Welding HAZ Mechanical Properties Control Chapter III Production and Control of Stomata in Welds Learning Objectives First Stomatals and identification 1. The source of the gas that forms the pores 2. The role of hydrogen and nitrogen on the weld metal 3. The oxidation and reduction of the weld metal 4. The type and identification of pores Measures I. Stomatal formation process analysis II. Analysis of factors affecting stomata generation III. Welding seam stomatal control expert dial operation and training Chapter 4 Hazards and Control of Inclusions in Welds Learning Objectives Section I Types and Hazards of Weld Inclusions I. Types of Weld Inclusions II. Hazards of Weld Inclusions Experts Point to Section II Weld Inclusions Control 1. Welding metal desulfurization and dephosphorization measures 2. Control measures for weld inclusions Experts' dialing operations and training Chapter 5. Weld joint crack generation and control Learning objectives Section 1 Hazards and types of cracks I. Cracks Hazard 2. The classification of cracks by experts. Section 2. Control of hot cracks in welding 1. The types of hot cracks 2. The causes and control of crystallization cracks in welds 3. The causes of high-temperature liquefaction cracks and the experts: Section 3. Cold welding cracks Control 1. Types and characteristics of cold cracks 2. Causes and control of delayed cracks 3. Causes of quenching and embrittlement cracks and control experts to point out Section 4 Control of other welding cracks 1. Prevention of layered tears in welded joints Second, the prevention of stress cracks in welded joints. Third, the identification of welding cracks. Experts' thoughts and exercises. Appendix. Symbols for mechanical properties of metal materials. Offer