scholarly journals Quality Control of Welded Joint During Ultrasonic Welding of Plastics

2017 ◽  
Author(s):  
С.С. Волков ◽  
◽  
А.А. Дерябин ◽  
С.С. Холодов ◽  
◽  
...  
Keyword(s):  
Quality Control ◽  
Welded Joint ◽  
Ultrasonic Welding

Features of the Heating Process in Ultrasonic Welding of Polycarbonate Products under Independent Pressure

2020 ◽  
pp. 54-62
Author(s):  
S.S. Volkov ◽  
A.L. Remizov ◽  
A.S. Pankratov
Keyword(s):  
Welded Joints ◽  
Welded Joint ◽  
Welding Process ◽  
Ultrasonic Welding ◽  
Heating Process ◽  
Mechanism Of Formation ◽  
High Quality ◽  
Acoustic Contact ◽  
Welding Pressure

This paper presents a mechanism of formation of a hard-to-weld polycarbonate joint by ultrasonic welding. The method utilizes internal and external friction occurring in the welded joint area on abutting surfaces due to shear vibrations of the end of the upper part relative to the lower part. A layer of the heated welded material is formed, localized by thickness, in which predominant absorption of the ultrasonic vibrations occurs, which allows one to obtain high-quality and durable welded joints without significant deformation due to the concentration of thermal energy in the welding zone. The effect of independent welding pressure on the strength of the welded joint of polycarbonate is considered. A new method of ultrasonic welding under the conditions of independent pressure is proposed. The method consists of dividing the static welding pressure into two components: the pressure of the acoustic contact in the zone of contact of the waveguide with the product, and the welding pressure that compresses the welded products, with the latter component being lower than the former. In order to obtain high-quality welded joints made of polycarbonate and to prevent displacement of the welded edges during the welding process relative to each other, a special preparation of the welded edges is developed, which allows one part to be moved vertically relative to the other during the welding process. It is established that the quality of welding depends on the speed of movement and the angle of cutting the edges.

scholarly journals The Influence of Technological Parameters on Durability of Products from ABS Plastic at Ultrasonic Welding

2019 ◽  
pp. 17-26
Author(s):  
S.S. Volkov ◽  
S.A. Korolev ◽  
D.S. Rozanov
Keyword(s):  
Welded Joint ◽  
Oscillation Amplitude ◽  
Heat Removal ◽  
Amplitude Distribution ◽  
Ultrasonic Welding ◽  
Optimal Choice ◽  
Welding Parameters ◽  
Technological Parameters ◽  
Welding Pressure

An ultrasonic welding method for round-shaped products made from ABS plastic is described in this paper. This method can eliminate roughness and waviness on the contact surface between the planimetric waveguide and the welded part, increase heat removal from the surface of the welded part in the subwaveguide zone and improve the efficiency of ultrasonic welding as well as the strength and quality of the welded joint. It is shown that a mushroom-shaped waveguide is the optimal choice for planimetric ultrasonic welding of ABS parts of the fan wheel type with regard to the uniformity of the oscillation amplitude distribution along the perimeter of the waveguide’s working end face. The optimal form of the waveguide’s working end face is defined that entails fixing the connecting parts relative to the waveguide’s axis along their diameter. It is established that at a certain combination of the ultrasonic welding modes for ABS plastic the rate of deformation at large welding pressures can turn out to be higher than at small pressures. This is caused by the competition of three factors: temperatures, static welding pressure and concentration of energy on the welded surfaces. It is determined that for welding ABS plastic the so-called soft modes of ultrasonic welding with small static welding pressure and oscillation amplitude of the waveguide’s end face should be used. In this case welding occurs only due to the distribution of microroughness, without dents from the waveguide on the surface of the welded material. Optimal welding parameters for ABS plastic are determined.

scholarly journals Ultrasonic welding of folding boxboards

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5766-5779
Author(s):  
Claire Monot ◽  
Jérémie Viguié ◽  
Quentin Charlier ◽  
Julien Bras ◽  
David Guérin ◽  
...  
Keyword(s):  
Welded Joint ◽  
Coating Layer ◽  
Ultrasonic Welding ◽  
Environmental Concerns ◽  
Welding Zone ◽  
Degradation Reactions ◽  
Polymer Binders ◽  
Technological Challenge ◽  
Mechanical Performances ◽  
Coating Weight

Today’s environmental concerns are pressuring industries to substitute paper-based materials in place of plastics in many sectors including packaging. However, assembling papers and paperboards using environmentally friendly solutions remains a technological challenge. In this context, ultrasonic (US) welding is an alternative to adhesives. In this work, the potential of US welding to assemble folding boxboards was investigated. Folding boxboards are commonly coated to enhance printability. This coating is generally composed of mineral pigments (85 to 90%) and polymer binders (10 to 12%). This study evaluated whether the presence of the coating layer allows the assembly of paperboards by US welding. Results indicated that welding coated folding boxboards is possible provided that coating weight and binder content are high enough. The mechanical performances of the welded boards met the requirements of most packaging applications. Adhesion in the welded joint resulted from a combination of thermoplastic (melting and flowing of the binder) and thermoset (degradation reactions) effects. However, it was not possible to assemble coated folding boxboards without degrading the welding zone. While the materials and process need to be optimized, this work represents a big step forward toward the adhesive-free assembling of paper-based materials.

Research on Tensile Strength in the Ultrasonic Welding Joint of T-Type Wood-Plastic Composites Components

2012 ◽  
Vol 601 ◽  
pp. 46-49
Author(s):  
Hui Zhao ◽  
Yi Long Zhou ◽  
Hong Yuan Zhu ◽  
Sheng Yuan Zhang
Keyword(s):  
Tensile Strength ◽  
Welded Joint ◽  
Wood Flour ◽  
Ultrasonic Welding ◽  
Wood Plastic Composite ◽  
Wood Plastic Composites ◽  
Plastic Composite ◽  
Plastic Composites ◽  
Welding Technology ◽  
Scanning Electron

Ultrasonic welding technology is applied to the connection of T-type wood-plastic composites components to study its performance. The wood-plastic composite materials are made up of 60% wood-flour (WF), 36% polypropylene (PP) and 4% maleic anhydride grafted PP (MAPP). Tensile strength of the welded joint, which oscillation time is 4 seconds, is analyzed based on experimental data. Welded joint is observed by scanning electron microscope and its connection status is analyzed. Experiment results show that ultrasonic welding technology can be applied to T-type wood-plastic composites component, which has enough tensile strength.

Rosenhain Centenary Conference - 2. Design implications for materials selection 2.8 Weldability and toughness specifications for structural steels in Japan — with special reference to WES-155 and -156 Discussion

1976 ◽  
Vol 282 (1307) ◽  
pp. 263-275
Keyword(s):  
Quality Control ◽  
Welded Joint ◽  
Steel Structure ◽  
Structural Steels ◽  
Cooling Time ◽  
Materials Selection ◽  
Diffusible Hydrogen ◽  
Welding Condition ◽  
Factors Affecting ◽  
Welding Procedure

First of all, I should like to emphasize that WES 135 is just a material specification for quality control. So, as Burdekin (Keynote) pointed out, it does not contain any statements about the influences of real welding procedure. It goes without saying that, for application purposes, we should take account of many important factors affecting the behaviour of materials in a real structure. For example, in order to avoid weld cracking in real structures, we must have the critical cooling time determine rom weldment cracking parameter, P w , which is expressed as follows: jPcm + 60 + 40000’ where H is the concentration of diffusible hydrogen content under the welding condition used (cm 3 / 100 g) and K is the intensity of restraint of real welded joint in structure (kg-mm/mm) We compare the P w value thus obtained with the cooling time in the actual steel structure obtained from the welding procedure depending on heat input, preheating condition and p ate thickness etc. If the critical cooling time to avoid weld cracking obtained from P w is less than the cooling time obtained for real structures we do not expect weld cracking (K. Satoh, S. Natsu, et al 11W Doc. IX-834-73).

Ultrasonic Welding Performance Analysis of Wood-Flour/PP Composites

2011 ◽  
Vol 183-185 ◽  
pp. 2288-2292
Author(s):  
Hui Zhao ◽  
Yi Long Zhou ◽  
Hong Yuan Zhu ◽  
Qing Wen Wang
Keyword(s):  
Maleic Anhydride ◽  
Welded Joint ◽  
Wood Flour ◽  
Tensile Tests ◽  
Ultrasonic Welding ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Plastic Composites ◽  
Pp Composites ◽  
Better Than

In order to analyze the possibility of ultrasonic welding of wood-plastic composites, wood-flour(WF)/ polypropylene(PP) composite was ultrasonic welded, which contained 60%WF, 36%PP and 4% maleic anhydride grafted PP. The ultrasonic welding performance was evaluated by tensile tests and scanning electronic microscopy(SEM). The triangle energy direct stick was used in the ultrasonic welding. The results showed that WF/PP composite was successfully ultrasonic welded directly, while in the presence of energy direct stick, the strength of the welded joint was even better than the composite itself. It was concluded that the ultrasonic welding was suitable to WF/PP composites.

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