Advanced Welding Technician Technology

Author: Chief Editor: Wang Liangdong
Publisher:
Publish Date: 2000-05-01
Features: Written according to the requirements for senior and intermediate workers in the "Occupational Skill Qualification Standard (Assessment Outline) for Electric Welders" issued by the Ministry. The main content includes: testing methods for welded joints, welding of dissimilar metals, stress distribution and static load strength calculation of welded joints, causes and preventive measures for failure of welded structures, quality assurance measures for welded joints, production process of welded structures and relevant knowledge of welded structure workshops, and finally, it introduces fourteen typical welding examples that demonstrate the operational skills of senior electric welders. This book serves as a vocational skill training textbook for senior electric welders and can also be used by welding professionals, teachers and students of technical schools, and engineering technicians engaged in welding work.
Excerpt:
Training requirements for testing methods involve proficiently mastering the quality evaluation testing methods for welding materials and various weldability testing methods; understanding other commonly used testing methods for welded joints.
Section Welding Material Quality Evaluation Testing Methods
The general term for materials consumed during welding (including electrodes, welding wires, fluxes, gases, etc.) is called welding materials. Welding materials not only affect the stability of the welding process but also impact the appearance and internal quality of welds. Therefore, evaluating the quality of welding materials through testing to ensure that materials meeting relevant standards are used in production is a crucial key to guaranteeing weld quality. If an electrode is eccentric, then δ1 ≠ δ2. If δ1 > δ2, then μ1 < μ2, resulting in L1 < L2, and the impedance of coil N1 is smaller than that of N2. This allows current to flow through the galvanometer in the external annular circuit, causing the pointer to indicate. Based on the indication value, calculations can be performed to determine the eccentricity of the electrode.