An instructor's manual and student activity guide on gas welding are provided in this set of prevocational education materials which focuses on the occupational cluster of trade and industry. (This set of materials is one of ninety-two prevocational education sets arranged around a cluster of seven vocational offerings: agriculture, home economics, distributive education, health occupations, world of work, trade and industry, and office occupations.) The instructor's guide is organized into the following elements: title of activity, duration of activity (four to ten periods), activity goals, seven instructional objectives, related vocational clusters, and activity implementation (description, materials needed, safety considerations, teacher preparation prior to class, during the class, follow-up activities, answer key to student check point activities, masters for duplication [e.g., a handout on the proper setup and use of an oxygen-acetylene welding outfit, student checklist booklet] and a set of transparencies). The student activity guide, focusing on the production of a metal belt buckle, provides step-by-step instructions (narrative and illustrations) for completing each instructional objective (e.g., cutting, shaping and deburring, drilling, welding, and finishing metal). At the end of each set of instructions is a student check point (evaluation activity). Occupational descriptions for a gas welding-machine operator and a gas welder conclude the document. (JH)