Development of tubular transition joints of aluminium/stainless steel by deformation diffusion bonding

Science and Technology of Welding and Joining

Lee

2008

Forge welding (FOW) and hot pressure welding (HPW) are solid state welding processes. They are capable to be used for joining dissimilar metals. This paper presents a qualitative study of bimetallic joints produced by these two processes under various welding temperatures T and depths of deformation d. The test materials are stainless steel 316L and 6063 aluminium alloy. This combination can take advantage of both excellent wear resistance and light weight. The joint quality was examined by tensile tests and metallographic observation. The quality characteristics such as tensile strength s and the continuity of diffusion zone are discussed. The results show that the bimetallic joints produced by the FOW are superior in quality to those produced by the HPW.

Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 81%

Qualitative study of bimetallic joints produced by solid state welding process

Science and Technology of Welding and Joining

Lee

2008

“…Forge‐welding and uniaxial tensile tests were carried out. The results showed that four bimetallic joints among 36 specimens were stronger than those obtained by Bhanumurthy et al [10]. Besides, the processing time of those forge‐welding processes was only a few seconds.…”

Section: Effects Of Process Parametersmentioning

confidence: 71%

“…The tensile strength of the quality joint was higher than that of the aluminium alloy. Bhanumurthy et al [10] investigated the diffusion bonded stainless steel and aluminium alloy specimens carried out at 315 °C for 4 h. An excellent bonding with the tensile strength of 91 MPa and total absence of the intermetallic compounds in the reaction zone were indicated.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Effects of Process Parameters in Forge‐Welding Bimetallic Materials: AISI 316L Stainless Steel and 6063 Aluminium Alloy

Lee

2009

Strain

Forge welding is a process that can overcome the limitations of friction welding and diffusion bonding for joining dissimilar metals, while still permitting a large amount of plastic deformation. However, the available information about forge welding of dissimilar metals is rare as most studies have focused on joining similar metals. This paper reports an investigation on effects of process parameters in forge-welding bimetallic materials: AISI 316L stainless steel and 6063 aluminium alloy. Experiments were carried out under variations in process parameters, including forge-welding temperature, amount of deformation and forging speed. The results showed that the forge-welding temperature was the most significant process parameter and that this could highly influence the tensile strength of the joint. The quality joint was produced successfully. It could withstand the tensile strength of 111.3 MPa and this was comparable to the findings of other researchers. The diffusion zone of the joint was examined by the optical micrograph and elemental composition analysis. Intermetallic compounds were found in the diffusion zone, which was critical evidence for the validity of the experiment.

“…There was no doubt about their weldability since previous researchers[29][30][31][32] had reported that such combinations of dissimilar metals could be joined by solid-state welding. If two metals are welded successfully, a narrow diffusionFig.…”

mentioning

confidence: 99%

Bulk-Forming Simulation of Bimetallic Watchcase Components

2014

JOM

This article presents a study of the effects of process parameters in bulkforming bimetallic watchcase components using finite-element (FE) simulation. This study aimed to determine the suitable forming temperature T and ram speed S for attaining the complete die filling of bimetals. A complicated watchcase component made of 3-mm-thick AISI 316L stainless steel (SS316L) and 6-mm-thick 6063 aluminum alloy (AA6063) was used as the example. The processes were simulated with T of 400°C, 500°C, 600°C, 700°C, 800°C, and 900°C and S of 20 mm/s, 40 mm/s, and 60 mm/s. Although the AA6063 was not heated in the beginning, it flowed faster than the SS316L during the process, and hence, the incomplete die filling was found mainly in the SS316L region. To avoid the incomplete die filling and strengthen the intermetallic bond between two dissimilar metals, the T of 900°C was suggested. The S of 40 mm/s was recommended also because this could save much forming energy and prevent the damage of tools. The experimental verification was carried out under process conditions that were employed in the simulations. An infrared thermal imaging camera and a 300-ton mechanical press were used to monitor the T and testify the bulk-forming operation, respectively. The data acquired from the experiments, on average, agreed strongly with those predicted by the simulations. On the basis of the results in this study, engineers can gain a better understanding of bulk-forming bimetallic components and be able to determine the T and S efficiently for similar processes.