Formation Features of a Welding Joint of Alloy Grade2 by the Friction Stir Welding using Temperature Resistant Tools

Елисеев

Колубаев

et al. 2020

Metals

Self Cite

The use of electric arc or gas welding in the manufacture of titanium components often results in low quality welded joints due to large residual stresses and strains. A successful solution to this problem can be found in the application of friction stir welding. However, friction stir welding (FSW) of titanium alloys is complicated by rapid tool wear under high loads and temperatures achieved in the process. This paper studies the durability of a tool made of ZhS6U Ni-based superalloy used for friction stir processing of commercially pure titanium and the effect of the tool wear on the weld quality. The total length of the titanium weld formed by the tool without failure comprised 2755 mm. The highest wear of the tool is observed at the base of the pin, which brings about the formation of macrodefects in the processed material. The tool overheating causes an increase in the dendrite element size of ZhS6U alloy. The transfer layer contains chemical elements of this alloy, indicating that the tool wear occurs by diffusion and adhesion. As a result of processing, the tensile strength of commercially pure titanium increased by 25%.

Section: Introductionmentioning

confidence: 99%

Wear of ZhS6U Nickel Superalloy Tool in Friction Stir Processing on Commercially Pure Titanium

Елисеев

Колубаев

et al. 2020

Metals

Self Cite

“…Due to the above-mentioned features of friction stir welding of titanium alloys, it is necessary to observe a number of requirements. In order to minimize oxidation during welding, protection in the form of inert gas should be used, for which mainly argon is used in the contact zone of the tool and material [83,85,107,343,352,353,355,358,359,[362][363][364][365][366][367][368]372,373]. It is possible to use both an open system of shielding gas blowing during welding [353,368], as shown in Figure 13, and to use a tightly closed chamber in the welding area [363].…”

Section: Peculiarities Of Friction Stir Welding Of Titanium Alloysmentioning

confidence: 99%

“…These include tungsten or molybdenum-based alloys [268,371,377,[385][386][387][388][389][390][391]405], cobalt-based alloys [304,[392][393][394], polycrystalline cubic boron nitride [383,386,404], nickel alloys [85,106,368], hard alloys [268,343,357,377], etc. Although tools made of zirconium di-boride ZrB2, sintered titanium carbide, or Ni 3 Al-Ni 3 V intermetallic alloy were used for friction stir welding [367,406], the five types mentioned above are the main classes of friction stir welding tools currently investigated. Even among the rarely used materials for friction stir welding, some are quite suitable, forming an equally strong base metal joint and having no significant influence on the structure of the stir zone [354], though information about the wear of these tools in welding is not found in the literature.…”

Section: Peculiarities Of Friction Stir Welding Of Titanium Alloysmentioning

confidence: 99%

“…However, there is a significant difference in the FSW/FSP of titanium α-alloys and FSW/FSP of titanium (α + β)-alloys. So, in the case of titanium α-alloys, the TixNiy intermetallides are much fewer, and they can be detected only during scanning tests [311,313,367,373,376], while in the case of titanium (α + β)-alloys, these intermetallides are detected at the macrolevel [81,85,365,366,368].…”

Section: Cobalt-based Alloysmentioning

confidence: 99%

See 1 more Smart Citation

Friction Stir Welding/Processing of Various Metals with Working Tools of Different Materials and Its Peculiarities for Titanium Alloys: A Review

Чумаевский

Иванов

et al. 2023

Metals

A review of the state of research in the field of friction stir welding and processing has been carried out. The features of plastic flow in friction stir welding and their connection with the processes of adhesion friction are shown. The main direction of research is related to the features of friction stir welding of titanium alloys. Special attention is paid to the selection of working tool materials from various alloys for friction stir welding and the processing of titanium alloys. The main advantages and disadvantages of applying different types of tools for friction stir welding of titanium alloys are shown. Different mechanisms of tool wear in friction stir welding associated with the interaction of processed material and tools are demonstrated. Information on the influence of tool and material interaction at welding on the mechanical properties and operational characteristics of obtained joints is given.

Formation of α’ titanium welds by friction stir welding

Елисеев

Beloborodov

et al. 2020

J. Phys.: Conf. Ser.

In the present study, investigation of the macrostructure of α’ titanium alloy weld produced by the friction stir welding has been carried out. The welding process modes were also selected. It is shown that in case of insufficient load on the tool, an open weld defect is formed. Increasing the load (with decreasing RPM) eliminates the open tunnel and minimizes defects. Despite the presence of defects, the strength of welds has reached the strength of the initial material. As a result of FSW, grain size has been reduced by 7.3 times, but the load increase has not affected the grain structure. The results of the research show that the part of welding tool had been stirred in the structure of weld. However, nickel base alloy tool had passed about 500 mm of weld, before starting to wear out.