Abstract At the moment, high production costs prevent friction stir welding (FSW) process from further industrial applications even if comparable fatigue strength of joints can be reached. Higher speed may reduce but decrease manufactured FSW joints. A potential solution is a mechanical post weld treatment directly after to increase joint again. In this study, hydrostatic deep rolling was appli...

Dissimilar Metal Welds are required in high temperature sections of boiler reheater and superheater tubing to join low alloy steel tubing to the finishing stainless tubing. The intrinsic difference in the coefficients of expansion cause high stresses to develop at the relatively weak ferritic/weld interface. The power generation industry began to experience failures of type 309 stainless steel ...

In the present study, friction spot welding or refill friction stir spot welding was performed to consolidate dissimilar AA5754 Al and AZ31 Mg alloys. The intermetallic compounds of Al12Mg17 and Al3Mg2 were primarily found in the weld, distributed at the interface between the base materials and in the Al top sheet. The distribution of the intermetallic compounds and the interfacial area between...

During the last several years we have been investigating ultrasonic techniques for evaluating the quality of solid state weld interfaces [1 ,2]. Promising results have been obtained on a variety of different solid state welds by extracting features from the ultrasonic waveforms and applying pattern recognition algorithms to separate acceptable from unacceptable welds. In general, the primary di...

A new model-based approach for ultrasonic phased-array testing of dissimilar welds based on the direct measurement of the wave speeds inside the real weld by using scanning laser vibrometry is presented. With this technique the interaction of different wave modes with the weld can be studied in detail leading to important consequences for the measuring set-up. Together with the geometry of the ...

The microstructure of HP stainless steel in aged and aged + solution annealed conditions and solutionized alloy 800 was characterized by optical microscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) equipped by EDS. All phases present in the above condition were described. The effects of solution annealing heat treatment temperature on the microstructure, te...

Abstract: The investigation is carried out to characterize welding of AISI 310 austenitic stainless steel to Inconel 657 nickel-chromium superalloy. The welds were produced using four types of filler materials: the nickel-based corresponding to Inconel 82, Inconel A, Inconel 617 and austenitic stainless steel 310. This paper describes the effects of aging treatment on the joint. The compara...

Very important property of powder metallurgy parts is ability to join components produced by different manufacturing technologies or dissimilar materials. Properties Nb modified HK30 are highly influenced conditions applied during sintering. Weldability sintered can be improved using favorable sintering conditions. In this regard, effect parameters on fusion weldability presented in paper. Inve...

In ferrite/austenite dissimilar metal welds, carbon can diffuse from the ferritic low-alloy steel to austenitic weld during heat treatment and thermal aging due large chromium content differences between two alloys. This influx leads precipitation of carbides in high-alloy metal, near fusion boundary, which affect properties joint. was investigated using multiple characterization techniques: el...

Laser beam welding produces good quality welds with minimum shrinkage for sheet metal joints. The quality of welded joint depends upon surface morphology, hardness, mixing of liquid phases and metallurgical non-homogeneity induced by gradients of temperatures and cooling rate at the weld interface. In the present investigation, Titanium Grade5 (Ti) and AA2024 (Al) alloy dissimilar sheet metals ...