Real-time estimation of weld quality from process data is one of the key objectives in current weld control systems for resistance spot-welding processes. This task can be alleviated if the weld controller is equipped with a voltage sensor in the secondary circuit. Replacing the goal of quantifying the weld quality in terms of button size by the more modest objective of indirect estimation of t...

The distortion of laser welded titanium plates was assessed for different operating conditions of the laser welding device, and with different welding parameters (in terms of weld point and prewelding). In this study, Nd : YAG laser welding device was used to join the titanium plates. The results showed that distortion increased stepwise after each welding point along the welding zone (one-side...

Neural network modelling has been applied to search for novel high strength steel weld metal compositions, potentially offering improved tolerance to variations in the weld thermal cycle. An experimental 7 wt% Ni manual metal arc electrode, formulated on these predictions, was used to produce all-weld metals and welds in high strength steel. Mechanical properties were correlated to weld metal m...

Visual sensing technology is widely used in welding practices because visual devices are decreasing in price, increasing in reliability and improving in image processing hardware and software. As the most studied welding sensor, CCD(Charge Coupled Device) is more suitable for quality control of welding process than other means of sensing devices because it can obtain both two dimensional and th...

In December 2006, the Boiling Water Reactor Vessel and Internals Project (BWRVIP) issued a letter mandating two-sided coverage for the volumetric examination of BWR core shroud welds. In this letter, they noted that: “Ultrasonic flaw detection and sizing performance is degraded by stainless steel or nickel allow weld metal. The base metal examination volumes on both sides of the weld should be ...

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...