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From a practical perspective, this book systematically explains welding operation problems that often occur in actual production in the form of questions and answers. It is a guide book for welding workers to learn, master, and improve operating techniques. The book includes four parts: basic knowledge of welding technology, electrode arc welding, tungsten arc welding, and CO2 gas shielded welding. This book combines theory with practice, the language is concise and concise, and it is highly targeted and practical. By self-study in this book and strengthening practice according to relevant guidance, readers will master the skills and tricks of welding operations in a short period of time and become an excellent welder.