Hot Cracking Susceptibility of Wrought 6005 and 6082 Aluminum Alloys (original) (raw)
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Investigation of Hot Cracking in the Welding of Aluminium Alloys (6005 & 6082)
In the welding of aluminium 6000 series, hot cracks can easily be produced if the welding conditions and welding procedures are not carefully observed. The aim of this study is to find out some of the factors that cause hot cracks theoretically and experimentally and how to minimize or avoid this undesirable outcome when welding 10 mm thick heat treatable wrought aluminium alloys 6005 T6 and 6082 T6 bead-on-plate using 4043 and 5356 alloy filler metal by mechanized TIG and MIG welding processes. The welding process, filler metal composition and preheating temperature have been chosen as the main factors affecting the formation of liquation cracking. A comparison of these welding processes will be made based on heat input (Q), and optimum welding parameters for these extruded profiles will be specified. The influence of different factors on sensitivity to cracking is evaluated by preparing macro and micro photos of the test samples, and Vickers hardness tests were used to examine the...
Metallurgical and Mechanical Properties of Heat Treatable Aluminum Alloy AA 6082 Welds
2017
Heat treatable alloy AA6082 is a medium strength alloy with have excellent formability from simple to complex profiles by extrusion and good corrosion resistance characteristics. It is one of the most widely used alloys and has considerable industrial interest. These materials can be heat treated to produce precipitation to various degrees. Mg and Si are the major solutes they increase the strength of the alloy by precipitation hardening. This article presents a survey for the main work done concerning welding and heat treatment carried out to this alloy. Metallurgical and mechanical properties of the AA6082 similar and dissimilar welds were reviewed.
Effect of Heat Input on the Structure and Properties of Aluminium Weldment
Iranian Journal of Materials Science and Engineering, 2013
The probable reasons for evolution of weld porosity and solidification cracking and the structure- property relationship in aluminium welds were investigated. Aluminium plates (1xxx series) were welded by Tungsten Inert Gas (TIG) welding process, 5356 filler metal was used and heat input was controlled by varying welding current (145A, 175A and 195A). The welded samples were examined under optical and scanning electron microscopes and mechanical tests were performed to determine tensile and impact strengths. Secondary phase, identified as globules of Mg 2Al 3 precipitates, was found to be formed. Solidification cracking appeared in the heat affected zone (HAZ) and porosities were found at the weld portion. The tendency for the formation of solidification cracking and weld porosities decreased with increased welding current.
Materials, 2019
Precipitation hardening aluminum alloys are used in many industries due to their excellent mechanical properties, including good weldability. During a welding process, the tensile strength of the joint is critical to appropriately exploit the original properties of the material. The welding processes are still under study, and gas metal arc welding (GMAW) in pulsed metal-transfer configuration is one of the best choices to join these alloys. In this study, the welding of 6061 aluminum alloy by pulsed GMAW was performed under two heat treatment conditions and by using two filler metals, namely: ER 4043 (AlSi5) and ER 4553 (AlMg5Cr). A solubilization heat treatment T4 was used to dissolve the precipitates of β”- phase into the aluminum matrix from the original T6 heat treatment, leading in the formation of β-phase precipitates instead, which contributes to higher mechanical resistance. As a result, the T4 heat treatment improves the quality of the weld joint and increases the tensile ...
Study of cracking susceptibility in Al alloys welds
Aluminium has high expansion coefficient at large solidification shrinkage and wide solidification temperature range, due to these properties; Al-alloys are known to be susceptible to cracking. This paper is study about the defects which occurs during welding of aluminium Al-alloys crack is the most significant defect and it affects the mechanical properties in the material such as hardness, yield strength and tensile strength. During Aluminum welding some aluminium Al-alloys such as al-Cu, al-Mg, Al-Mg-Si etc. are more sensitive to solidification cracking. Hot cracking susceptibility depends on alloy content of the material. Same way liquation cracking susceptivity is increasing with increasing cooling temperature range
Effect of weld parameters on the properties of aluminium weldment
2006
Two different grades of aluminium pbtc> (lxxx and 5xxx ,.r1es) were welded \.ith two different filler metals (4043 and 5356) and with dIfferent current settmgs of 145A, 175/\ and 195A. Tung,ten Inert Gas ('1'10) welding process was used [or welding. Durmg weld"'g at dlffcrcnt conditions various eutectics, in!erme!allLc compounds and phases formed at dllTcrcm temperatures and at difTerent compositions. All of these phases contributed 10 a change Ln mechanical properties. In (he present research, a systematic mvcsllgMion was made on TIG welding of aluminium alloy to determine the probable reasons for evolutlon of ,olJdlli"allOn cracking of aiummmm weld and to improve the ,tructurepropel ty relalloosh,p "f wddmenl by controlling he"! input. It wa, expected that thc rcscar~h work will optlmL7.e (he process parameter to find out an 0pllmum condition for welding, When 4043 filler metal (Al-5% Si) was used for welding pure alummlum plate, (lxxx ,crie,) a ...
Journal of Materials Processing Technology, 2003
Weldability between an unreinforced aluminium alloy (AA6082) and an AA6092/SiC/25p composite, using as filler metals both Al-5Mg (ER5356) and Al-5Si (ER4043) unreinforced alloys, has been studied in the present work. One of the main requirements considered to obtain metallurgical weldability was to reduce at maximum the heat input to limit the possible interfacial reaction among molten aluminium matrix and SiC particles which produces aluminium carbide (Al 4 C 3) inside the weld pool and fusion line. For it, welding procedure selected was a gas shielded metal arc welding, working in pulsed current mode (MIG-P), to obtain an improved control of the metal transfer to the molten pool. Three kind of joint designs were used: "I", "V" and "X", working with one and two filler metal runs. Mechanical tests of welded joints showed that tensile strengths, for all these welding conditions, were very similar and close to 223 MPa, which is approximately the 65% of the AA6082-T6 one. In all cases, failure was located through the HAZ of the unreinforced alloy. The application of a postwelding heat treatment made possible to recover the 100% of the parent unreinforced alloy tensile strength.
Transstellar Journal , 2019
Aluminium 6082 is a moderate strength alloy with good weldability. Tungsten inert gas (TIG) welding is the most common welding process of this alloy. AA6082 is one of the major alloys used in automotive, shipbuilding, aircraft and structural applications. Tensile strength of welded joints is an important design parameter when it is used for these applications. ER 4043, which contains 5% silicon as major alloying element and ER5356, which contains 5% magnesium as major alloying element, are the most common filler materials used for the welding of AA6082 alloys. In the present investigation, magnesium is added to silicon-based ER 4043 filler wire at different percentage levels, and this new filler wire with altered chemical composition is used for welding of 6082 aluminium plates. The effect of adding magnesium to the filler wire is investigated by using design of experiments. From experiments it is found that this new filler wire is capable of providing higher tensile strength for the welded joint. It is found that the increase in the tensile strength is due to the formation of magnesium silicide intermetallic phase in the weld zone. The presence of various intermetallic phases are identified by microstructural analysis. The amount of magnesium content in the new filler wire which will give the maximum tensile strength to the joint is optimized by using factorial design, artificial neural network and genetic algorithm.
Chemical and Materials Engineering, 2014
A systematic investigation was made on TIG welding of aluminium alloy to improve the structureproperty relationship of weldment by controlling heat input. Aluminium plates of 1xxx series were welded with filler metal 4043 and with different current settings 145 A, 175 A and 195 A. The welded samples were examined under optical and scanning electron microscopes and mechanical tests were performed to determine hardness, tensile and impact strengths. An eutectic was found to form. At the highest current setting that is at the highest heat input the eutectic mixture was coarsest and largest in size and tend to form a continuous network. On the other hand at low heat inputs the eutectic mixture did not get sufficient time to grow or to form any continuous network. The change in microstructure with heat input is also supported by the hardness, tensile and impact strength values of these plates.