This book will acquaint readers with the main types of welding, manual arc welding techniques, features of automated and gas welding, types of protective equipment, gas cutting and gas flame soldering, the main welding defects and ways to eliminate them. Welding is one of the most common technological processes in mechanical engineering and construction. The simplest welding techniques have been known since ancient times. The ancients were known mainly for foundry welding. The parts to be joined were molded and heated, and the joint was filled with a previously prepared metal melt. To obtain products from iron and its alloys, it was necessary to heat the metal in blacksmith mines and forge it. This method is called mining, or blacksmith, welding.