Pure copper and aluminium alloy was joined by cold metal transfer welding with the assistance of an axial external magnetic field in this work. The results reveal that magnetic field led to a reduction of the average heat input and improved the wetting behaviour of the weld metal on the copper sheet surface. The thickness of the Al2Cu intermetallic compound layer formed at the interface was decreased from 50 µm for normal welding to 5 µm for the magnetic field-assisted welding process. The joint strength was observed to increase with the magnetic field. For a 21 mT and 10 Hz magnetic field, the maximum loading force reached up to 1.67 kN, resulting in an increase in joint strength by 33%.
TabanE., GouldJ. E. and LippoldJ. C.: ‘Dissimilar friction welding of 6061-T6 aluminum and AISI 1080 steel: properties and microstructural characterization’, Mater. Design, 2010, 31, 2305–2311. doi: 10.1016/j.matdes.2009.12.010
2.
LeeS. J., NakamuraH., KawahitoY. and KatayamaS.: ‘Effect of welding speed on microstructural and mechanical properties of laser lap weld joints in dissimilar Al and Cu sheets’, Sci. Technol. Weld. Joi., 2014, 19, 111–118. doi: 10.1179/1362171813Y.0000000168
3.
XueF. J S. B., LouJ. Y., LouY. B. and WangS. Q.: ‘Microstructure and properties of Cu/Al joints brazed with Zn–Al filler metals’, T. Nonferr. Metal. Soc., 2012, 22, 281–287. doi: 10.1016/S1003-6326(11)61277-6
4.
CaoR., SunJ. H. and ChenJ. H.: ‘Mechanisms of joining aluminium A6061-T6 and titanium Ti–6Al–4V alloys by cold metal transfer technology’, Sci. Technol. Weld. Joi., 2013, 18, (5), 425–433. doi: 10.1179/1362171813Y.0000000118
5.
ShangJ., WangK. H., ZhouQ., ZhangD. K., HuangJ. and LiG. L.: ‘Microstructure characteristics and mechanical properties of cold metal transfer welding Mg/Al dissimilar metals’, Mater. Design, 2012, 34, 559–565. doi: 10.1016/j.matdes.2011.05.008
6.
CaoR., JingM., FengZ. and ChenJ. H.: ‘Cold metal transfer welding–brazing of magnesium to pure copper’, Sci. Technol. Weld. Joi., 2014, 19, 451–460. doi: 10.1179/1362171814Y.0000000204
7.
SuY. C., HuaX. M. and WuY. X.: ‘Effect of input current modes on intermetallic layer and mechanical property of aluminum–steel lap joint obtained by gas metal arc welding’, Mater. Sci. Eng. A, 2013, 578, 340–345. doi: 10.1016/j.msea.2013.04.097
8.
SuY. C., HuaX. M. and WuY. X.: ‘Quantitative characterization of porosity in Fe–Al dissimilar materials lap joint made by gas metal arc welding with different current modes’, J. Mater. Process. Tech., 2014, 214, 81–86. doi: 10.1016/j.jmatprotec.2013.08.002
9.
BouabdallahS. and BessaihR.: ‘Effect of magnetic field on 3D flow and heat transfer during solidification from a melt’, Int. J. Heat Fluid Fl., 2012, 37, 154–166. doi: 10.1016/j.ijheatfluidflow.2012.07.002
10.
LiZ., PengL. and LiY. R.: ‘Effects of geometric parameters and axial magnetic field on buoyant-thermocapillary convection during detached solidification’, T. Nonferr. Metal. Soc., 2014, 24, 1512–1520. doi: 10.1016/S1003-6326(14)63220-9
11.
DennisB. H. and DulikravichG. S.: ‘Magnetic field suppression of melt flow in crystal growth’, Int. J. Heat Fluid Fl., 2002, 23, 269–277. doi: 10.1016/S0142-727X(02)00174-1
12.
YinX. Q., GouJ. J., ZhangJ. X. and SunJ. T.: ‘Numerical study of arc plasmas and weld pools for GTAW with applied axial magnetic fields’, J. Phys. D: Appl. Phys., 2012, 45, (28), 1–13. doi: 10.1088/0022-3727/45/28/285203
13.
ChangY. L., LiuX. L. and LinL.: ‘Impacts of external longitudinal magnetic field on arc plasma and droplet during short-circuit GMAW’, Int. J. Adv. Manuf. Tech., 2014, 70, 1543–1553. doi: 10.1007/s00170-013-5403-1
14.
MahajanS., BiradarN. S., RamanR. and MishraS.: ‘Effect of mechanical arc oscillation on the grain structure of mild steel weld metal’, T. Indian I. Metals, 2012, 65, (2), 171–177. doi: 10.1007/s12666-012-0118-9
15.
LiY., LuoZ., YanF. Y., DuanR. and YaoQ.: ‘Effect of external magnetic field on resistance spot welds of aluminum alloy’, Mater. Design, 2014, 56, 1025–1033. doi: 10.1016/j.matdes.2013.12.005
16.
LimY. C., YuX., ChoJ. H., SosaJ., FarsonD. F., BabuS. S., MccrackenS. and FlesnerB.: ‘Effect of magnetic stirring on grain structure refinement part 2 – nickel alloy weld overlayers’, Sci. Technol. Weld. Joi., 2010, 15, (5), 400–406. doi: 10.1179/136217110X12720264008231
17.
TanC. W., JiangZ. G., LiL. Q., ChenY. B. and ChenX. Y.: ‘Microstructural evolution and mechanical properties of dissimilar Al–Cu joints produced by friction stir welding’, Mater. Design, 2013, 51, 466–473. doi: 10.1016/j.matdes.2013.04.056
18.
BarekatainH., KazeminezhadM. and KokabiA. H.: ‘Microstructure and mechanical properties in dissimilar butt friction stir welding of severely plastic deformed aluminum AA 1050 and commercially pure copper sheets’, J. Mater. Sci. Technol., 2014, 30, (8), 826–834. doi: 10.1016/j.jmst.2013.11.007
