[email protected]

Achieving ultrafine-grained ferrite structure in friction

Ultrane-grained structure Weld metal Microstructure Recrystallization abstract Ultrane-grained (UFG) ferrite phase was the desired structure in the weld metal of high strength low alloy (HSLA) steel joints. In this study, submerged arc weld metal of a HSLA steel was subjected to friction stir processing (FSP) under a very low rotation EFFECT OF WELDING HEAT INPUT ON welding heat input to the distribution of microstructure formation and its mechanical properties at coarse grain heat affected zone (CGHAZ) of the ABS Grade A steel. Three heat input combinations which designated as low heat (0.99 kJ/mm), medium heat (1.22 kJ/mm) and high heat (2.25 kJ/mm) have been used to the weld specimen by using flux cored

FATIGUE IMPROVEMENT TECHNIQUES FOR WELDS

weld for some portion of the length of the weld - approach the yield strength of the weld or parent metal; this is especially true in the area at the weld toe where stress concentrations due to the local geometry are normally quite high. When the welded structure is subjected to service loads, the service stresses are superimposed on How to Choose Welding Materials for Stainless Steel Sep 25, 2020 · This is based on the metallographic structure of stainless steel at room temperature. When the mild steel is heated to 1550 ° F, its structure changes from a ferrite phase to an austenite phase at room temperature. When cooled, the structure of the low carbon steel is transformed into ferrite again. The austenite structure existing at high temperature is non-magnetic, and its strength is lower and its toughness is better than room temperature ferrite structure. L 33 Solidification of Weld Metalvalue of G.R produces finer grain structure than low G.R value. During welding, weld pool near the fusion boundary experiences high value of G and low value of R which in turn results in planar solidification and at the weld center reverse conditions of G and R exist which lead to the development of equiaxed grains. In fact, G and R varies

Microstructure and mechanical properties of high-strength

Jan 24, 2018 · Welded high-strength steel components have great potential for use in lightweight constructions or highly loaded structures. Welding of steels with a yield strength of more than 1100 MPa is particularly challenging because of the toughness requirements for the weld metal. Currently, a new generation of welding consumables with a minimum yield strength of 1100 MPa has been developed. Microstructure and mechanical property of 738 low alloy gas-tungsten arc welding (GTAW) 738 low alloy steel joint before and after post-weld heat treatment (PWHT). The microstructure of the weld metal of the as-welded (AW) joint consists of acicular ferrite, bainite and martensite austenite (MA) constituents. The fraction of each phase THE EFFECT OF WELDING ON MECHANICAL AND stir welding, arc welding, laser welding, plasma welding on mechanical properties such as tensile strength, toughness, hardness and microstructural properties of different grade of steels. The different steels which were taken for studies are stainless steel, low carbon steel, high strength low alloy steel, aluminum alloy etc.

The Effect of Welding Heat Input on the StructureProperty

Oct 19, 2019 · The gas tungsten arc welding technique is used with direct current electrode negative polarity. Welding is conducted in 1.19, 1.46, and 1.87 kJ mm 1 to evaluate the effect of heat input. The results show that the amount of ferrite phase decreases from 59.4% to 49.4% as the heat input increases. The Significance of Studying the Heat-Affected Zone of Mar 25, 2021 · The welding heat-affected zone of the longitudinally welded pipe belongs to the category of low carbon equivalent, which is composed of coarse grain area, phase change recrystallization area, incomplete recrystallization area, recrystallization area and age embrittlement area. The temperature in the superheated zone is between 1400 and 1100°C.Effect of Welding on Microstructure and Mechanical Low carbon steels that have less than 0.25% carbon, display good welding ability, because they can be generally welded without special precautions using most of the available processes. Concerning the previous studies related to the welding of low carbon steel, there are limited publica- tions [2-8].