Friction stir welding (FSW) is a new and promising welding process that can produce low-cost and high-quality joints of heat-treatable aluminum alloys because it does not need consumable filler materials and can eliminate some welding defects such as crack and porosity. In order to demonstrate the friction stir weldability of the 2017-T351 aluminum alloy and determine optimum welding parameters...

This article studies the multi-layer and multi-pass welding of circumferential weld in thick pipe an aviation enterprise, based on static characteristics arc, through data calculations experiments to verify relationship between arc voltage length, proposes use controller accurately adjust real time, improve stability, torch wiggler expand fusion width, meet adaptive adjustment wide weld, build ...

Tungsten Inert Gas (TIG) welding is a widely applied manufacturing process. Angular distortion is a major problem and most pronounced among different types of distortion in the butt welded plates. This angular distortion is mainly due to nonuniform transverse shrinkage along the depth of the plates welded. Restriction of this distortion by restraint may lead to higher residual stresses. However...

In this paper, laser welding Ni to Al using pulsed wave (PW) and continuous (CW) lasers was investigated. Weld quality strength were evaluated in terms of cross-section examination, intermetallic compounds formation, microhardness, shear test 90-degree peel test. The results show that deep penetration causes high melting pool temperature severe material mixing, which could result dominant AlNi3...

High-speed laser welding is a very efficient process that results in weld seams of high quality. The limited by the occurrence defects, such as humping and undercuts. It was found transition from without defects to with undercuts occurs when speed limit exceeded. also occur at slightly lower feed rates than humping. Thus, it concluded represent upper high-speed may be seen precursor regime.

In this paper, the stress intensity factor (SIF) expression for defected butt welds containing undercut and inclined lack of penetration (LOP) subject to far-field tensile stress is derived. Some of the standards such as ISO 5817 and BS EN 25817 have specified allowable limits for the length of the undercut and LOP defects and for the height of the weld. In addition, EN 29692 standard has deter...

The strength mismatch effect on the deformation behaviour of defect-free cross-weld tensile specimens, where there is a variation in strength along the length of the specimen, was investigated through 2D finite element analysis. A simple bi-material model, which is generally used in current engineering assessments (e.g. R6 “Assessment of the integrity of structures containing defects”) to exami...

I. Abstract: The prediction of the optimal weld bead width is an important aspect in shielded metal arc welding (SMAW) process as it is related to the strength of the weld. This paper focuses on investigation of the development of the simple and accurate model for prediction of weld bead width of butt joint of SMAW process. Artificial neural networks technique was used to train a program in C++...

With the continuous development of wind power generation technology and increase in demand for electric energy, height fan tower is more demanding. It very important to detect weld produced welding process tower. In this paper, an algorithm defect detection based on traditional image processing convolutional neural network proposed. Firstly, used gray collected by industrial camera. Then, seam ...

A detailed microstructural characterisation of the emerging weld-line grain structure, for bead-upon-plate welds in Ti-6Al-4V (Ti64) differing plate thickness, was performed. The microstructure studied formed during both steady state and non-steady sections within weld path, with portion being taken from end as bead heat source overhang edge plate. This allows effects welding process conditions...