Hot gas welding can be used to weld practically any shape or size of component, and the equipment has probably the lowest cost of all the plastic welding techniques. Fit the appropriate welding nozzle for the selected welding rod to the bak rion hot air tool. Air products welders handbook fusion welding the most widely used welding processes rely on fusion of the components at the joint line. Welding of plastics is of practical importance in many automotive, medical and electronic packaging applications. This includes chemical storage tanks, ducting, fume extraction systems, and wet benches for the semiconductor. There have also been developments in textile joining, and in joining dissimilar. Jones, in handbook of laser welding technologies, 20. This edition of the unitor welding handbook builds upon all the earlier editions. Welding handbook ninth edition volume 3 welding processes, part 2 american welding society. Fundamentals and new developments this paper provides a general introduction to welding fundamentals section 2 followed by sections on a few selected welding processes that have had significant developments or improvements over the last few years.
Plastic recognition by test welding if all other information is unavailable, a test weld can be tried on the back of the component using a known plastic welding rods rod type. The term plastic welding means the permanent joining of. Grewell, abe, iowa state university, 100 davidson hall, ames, ia 50011 usa email. Different type of plastics with welding temperature. Pdf this paper provides an introduction to some important facts and developments in the plastic welding field for assisting the. The purpose of the welding handbook for maritime welders is to provide guidance in modern welding and related processes and to provide the welder with a source of practical information on the right solution to specific onboard welding problems. Extending the weld time to increase the melt simply enlarges the original. The energy produces localised heating of the materials, causing them to soften and melt, thus allowing their. In hf welding, the plastic dielectric materials to be welded are. Thickness of the welded parts is limited by the power of the ultrasonic generator.
Pdf this paper provides an introduction to some important facts and developments in the plastic welding field for assisting the developments in future. The processes that are discussed are friction welding section 3, hot. At the time of the preparation of this chapter, the referenced codes. This method calls for greater manual skill and instinctive feel. Volume 2 of the american welding societys welding handbook, 8th edition, presents in1.
It produces a clean weld site with highly uniform joint quality, providing exceptional. It is ideal for fabricating various custommade items, as it can be tailored for welding parts with any joint geometry. Welding of plastics requires appropriate experience to prevent failure to maintain important process variables, such as overheating of the welding site, improper preparation of welded edges, or. Gas flame the molten metal must be protected from the atmosphere absorption of. Pdf welding handbook ninth edition volume 3 welding.
The frequency of acoustic vibrations is in the range 20 to 70 khz commonly 2040 khz. If a code or other standard is cited without a date of publication, it is. Only the high points will weld on a flat butt joint, resulting in erratic, inconsistent welds. Ultrasonic welding in ultrasonic welding, highfrequency vibrations generate heat at the interface of the parts to be joined, melting the plastic and creating a strong bond. High frequency welding is the process of fusing materials together by applying high frequency energy to the area to be joined. Experience gained from user contact and welding training of crewmembers showed that documentation aimed specifically at on board welding solutions was. Experience gained from user contact and welding training of crewmembers showed that. The ampltude of the acoustic vibrations is about 0. Welding of plastics is of practical importance in many automotive, medical and. The technique is fast, efficient, noncontaminating and requires no consumables. Materials that do not conduct electricity such as air, oil, and pvc are sometimes called dielectrics.
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