1 Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Unit 1 After completing Unit 1, you will be able to: ❍ Describe the various processes for making original drawings. ❍ Define and describe the parts of a print. ❍ Explain the various methods used to reproduce a drawing. ❍ Describe the advantages of developing drawings with a CAD system. ❍ Explain traditional printmaking processes. ❍ Explain the importance of welding information found on a print. ❍ List precautions in the care of prints. Key Words bluelines blueprint blueprint process computer-aided design (CAD) system computer-aided manufacturing (CAM) diazo process drawings electrostatic process engineering copiers imaging systems Prints—The Language of Industry Drawings are used by the welding industry to communicate ideas in graphic or picture form. Drawings are often the only means of showing the construction of a complex product and structures, Figure 1-1. Drawings are called the “language of industry.” It is a precise language that utilizes symbols. Symbols (lines and figures) have specific meanings to accurately describe the shape, size, material, finish, and fabrication of an object. The symbols are standardized and used as a universal language around the world. This standardization makes it possible to interpret and understand drawings made in other countries. Original drawings are seldom found on a job site or in a factory. They would soon become worn or soiled, making them difficult to read. Also, workers at differ- ent locations producing the various parts or subassemblies of a product or structure each need a set of drawings. This means that several sets of identical drawings are needed at the same time. Drawing a set of plans for each person who needs them is impractical because of the costs. Creating new originals to replace drawings that are damaged or ruined is also costly. Reproductions, or prints, of the original draw- ings or CAD model are used in these situations. To ensure quality in the production and fabrication of parts, version control of the prints is critical. Prints often will have a version or revision number that indicates the most recent print revision. ink jet printers laser printers microfilm process plotters print reproductions symbols tracing white print xerography Select the icons to access Drill and Practice activities. Ch01.indd 1 4/25/2019 1:30:55 PM