The plastic welding process
Plastic welding is welding for semi-finished plastic materials, and is described in ISO 472 [1] as a process of uniting softened surfaces of materials, generally with the aid of heat (except for solvent welding ).
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A new method is proposed to obtain the coefficients of plastic constitutive laws of weld metal via tensile test and hardness test. In this method, a general expression between hardness ratio and flow stress model coefficients is established.. the welding process (e.g., laser welding and high-frequency welding) is used for weight and process.
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Recently EWI conducted research to compare several quantitative and qualitative polymer weld quality evaluation methods including pressure decay leak testing, tensile testing, cross-sectional analysis, computerized tomography (CT) scanning, and microtome slicing.
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Correctly welded seams: Slight flattening of the welding rod No notches between the welding layers For PVC: Foamy to smooth bead No discolouring (e.g., brownish colour) For PE, PP, PVDF: Smooth double bead on both sides Dull surface in the area of the welding zone Example of a correctly welded seam. Flawed welding seams:
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Evaluation of the quality of polymer welds is essential to the development and production maintenance of a welding process. Weld evaluation methods can be categorized as destructive or nondestructive and as quantitative or qualitative. Each of these assessment types gives different types of information about the weld joint. Experimental work has been undertaken to demonstrate the ability of.
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The table below lists some of the more common evaluation methods for plastic welds, and the ones which have been selected for comparison in this paper have been highlighted. Experimental Procedure Two assemblies were welded for evaluation at each of the seven conditions described in Table 2.
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Evaluation of plastic weld quality is a multi-industry challenge. Typical methods of weld evaluation such as mechanical or leak testing can determine whether a weld can accommodate a defined application requirement, but do not indicate whether the weld itself is good.
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Fernandez Villegas I, Valle Grande B, Bersee HEN, et al. A comparative evaluation between flat and traditional energy directors for ultrasonic welding of CF/PPS thermoplastic composites. Compos Interfaces 2015; 22: 717-729.
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The G1A Subcommittee on Hot Gas Welding and Extrusion Welding was formed in 1993 to create standards for the qualification of hot gas and heated tool plastic welding personnel. DVS 2202-1, Imperfections in thermoplastic welding joints; features, descriptions, evaluation, was used extensively in the creation of this standard.
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Several standards exist to guide the analysis of polymers and plastic welds. The American Welding Society Specification for Standardized Ultrasonic Welding Test Specimen for Thermoplastics describes both the design of standard I-beam samples and the method by which they should be tensile tested [1].
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(Nov/Dec-23) PLASTIC WELDING: Plastic Welding Q & A (Jul/Aug-02) PLASTIC WELDING: Plastic Welding Q & A (May/Jun-02) PLASTIC WELDING: Inspection and Testing of Plastic Welds (Mar/Apr-02) PLASTIC WELDING: Fabrication of Plastic Parts (Jan/Feb-02) PLASTIC WELDING: Prototyping (Nov/Dec-01)
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Abstract. This paper describes various mechanical tests that are currently used in industry to determine the quality of welds in plastics. These tests include short-term tests, such as bend tests, tensile tests, lap shear tests and impact tests, and long-term tests such as the tensile creep rupture test. The advantages and disadvantages of each.
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Abstract Mechanical deformation of the plastics depends on the temperature, time and viscoelastic nature. The duration of the applied stress and the overall stress history are the stages dictating.
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In the applied strain method, six components of the plastic strain of each weld are calculated by performing a 3D moving source analysis on a small 3D model with a shorter length, then the plastic strain components of the small models are mapped and superposed to a large 3D structural model to obtain the final distortion results.
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Structural Integrity Evaluation of Plastic Welding (Heat Stake) Tower in Door Trim Panels of Vehicles Using Finite Element Method 2015-36-0242. Structural integrity is a characteristic that must be evaluated during development of plastic parts as door trim panels. One of the critical areas in door trims is the interface between different parts.
