In this study, the liquation cracking susceptibility in heat-affected zone of CM247LC superalloy gas turbine blades during repair welding was quantitatively evaluated using a newly developed pre-weld Varestraint test method. The geometry replicated through tests for bead. susceptibility, that is, temperature range (LCTR), could be visualization at time crack formation test. LCTR alloy welds (he...

A new method for implementing collision welding at a laboratory scale has been developed. The pressure that drives the flyer plate toward the target is created by electrically driven rapid vaporization of a thin metallic conductor, rather than by chemical explosives or magnetic forces. Dissimilar welding couples of copper-titanium, copper-steel, aluminum-copper, aluminummagnesium and titanium-s...

This work aims at investigating the spot weldability of a new advanced Quenching and Partitioning (Q&P) steel and a Transformation Induced Plasticity (TRIP) steel for automotive applications by evaluating the effects of the main welding parameters on the mechanical performance of their dissimilar spot welds. The welding current, the electrode tip voltage and the electrical resistance of sheet s...

There were investigated properties of WMD, especially metallographic structure, toughness and fatigue strength of welds with various oxygen amount. The connection between the properties of welds with the content of oxygen in WMD were carried out. The research results indicate that it should be limited oxygen content in steel welds. Subsequent researchers could fi nd more precisely the most bene...

The solidification cracking behavior in laser welds of steel/copper dissimilar metals was systematically investigated. T2 copper and SUS304 stainless steel were used the study. results showed that occurrence synergistic effect ? phase liquation, inclusions composition segregation. During welding process, liquation grain boundaries substantially reduced cohesion between adjacent grains, as well ...

The application of magnesium (Mg) inevitably involves dissimilar welding with steel. A novel solid state spot method, refill friction stir (refill FSSW), was utilized to weld AZ31 Mg alloy galvanized DP600 Although Mg/Fe is an immiscible system, defect-free welds high strength were successfully obtained in a wide parameter window. results microstructure, interfacial reactions, and mechanical pr...

In the present study, the Weldability and microstructure of dissimilar welds of AISI 347austenitic stainless steel to ASTM A335 low alloy steel was investigated. For this purpose, gas tungsten arc welding process and two filler metals including ERNICr-3 and ER309L were used. After welding, the microstructure of the different zones of each joint, including weld metals, heat affected zone (HAZ) 1...

This research aims to investigate the material flow behaviour and microstructure evolution in friction stir welded joints of dissimilar aluminium alloys AA2024/AA5086. AA2024 plate was placed on re- treating side; using threaded conical flat shoulder tool rotating at 635 rpm moving along joint line with a speed 75mm/min. Mixing both clearly visible zone resulted features typical welding solid s...