Welding handbook ninth edition volume 3 welding processes, part 2 american welding society. Extending the weld time to increase the melt simply enlarges the original. Welding of plastics is of practical importance in many automotive, medical and. For further information on the categorization of the welding, joining, cutting, and allied processes, see appendix a. It produces a clean weld site with highly uniform joint quality, providing exceptional.
In hf welding, the plastic dielectric materials to be welded are. Jones, in handbook of laser welding technologies, 20. Air products welders handbook fusion welding the most widely used welding processes rely on fusion of the components at the joint line. Unitor face shields for welding are made from a lightweight, robust plastic. The frequency of acoustic vibrations is in the range 20 to 70 khz commonly 2040 khz. Materials that do not conduct electricity such as air, oil, and pvc are sometimes called dielectrics. 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. 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. Different type of plastics with welding temperature. Plastic welding, ask latest information, plastic welding abstract,plastic welding report,plastic welding presentation pdf,doc,ppt,plastic welding technology. 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.
Pdf this paper provides an introduction to some important facts and developments in the plastic welding field for assisting the developments in future. Volume 2 of the american welding societys welding handbook, 8th edition, presents in1. At the time of the preparation of this chapter, the referenced codes. The ampltude of the acoustic vibrations is about 0. Welding of plastics 2 introduction to welding when two interfaces of the same polymer are brought together in a molten state, the interfaces will conform to each. In fusion welding, a heat source melts the metal to form a bridge between the components. The technique is fast, efficient, noncontaminating and requires no consumables.
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. Pdf welding handbook ninth edition volume 3 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. Thickness of the welded parts is limited by the power of the ultrasonic generator. Grewell, abe, iowa state university, 100 davidson hall, ames, ia 50011 usa email. Gas flame the molten metal must be protected from the atmosphere absorption of. Experience gained from user contact and welding training of crewmembers showed that documentation aimed specifically at on board welding solutions was. There have also been developments in textile joining, and in joining dissimilar. This method calls for greater manual skill and instinctive feel. This includes chemical storage tanks, ducting, fume extraction systems, and wet benches for the semiconductor. Welding of plastics is of practical importance in many automotive, medical and electronic packaging applications. Experience gained from user contact and welding training of crewmembers showed that. At the time of the preparation of this chapter, the referenced codes and other standards were valid.
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. If a code or other standard is cited without a date of publication, it is. The plastic melts in the contact area, the polymer molecules are crosslinked, forming a strong joint. The energy produces localised heating of the materials, causing them to soften and melt, thus allowing their. Only the high points will weld on a flat butt joint, resulting in erratic, inconsistent welds.
813 643 615 746 1352 316 577 396 338 597 1564 1385 592 694 942 408 1348 89 1143 111 167 514 1450 1055 300 1273 1229 105 646 324 1168 448 930 573 726 1340