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- noun the process of joining pieces of metal or plastic together by heating them to suitable temperatures, with or without the application of pressure, and with or without the use of filler material
- The process of joining surfaces or parts by applying heat and/or pressure. A flux may or may not be used. The joined parts are usually metallic, and although heat is usually utilized, cold welding relies only on pressure. Other forms include arc, high frequency, electron beam, laser, and resistance welding.