Abstract
Using laser beam as main heat source, and trailing arc as an assisted role, aluminum alloy was joined to galvanized steel in a butt configuration. Under suitable welding parameters, a sound welding seam was obtained. The interface intermetallic compounds layer and wetting behavior of weld joint were studied. The assisted arc can improve the wetting and spreading ability of weld pool duo to large temperature field. There are two different types of IMCs: near to the steel side one is Fe2Al5 with tooth-like shape and near to the weld seam side is the other one Fe4Al13 with flocculent-like shape. The highest tensile strength can reach 163 MPa when the fracture occurred at the weld seam.
Highlights
In recent years, low carbon emission and lightweight design have been concerned by the automobile industry [1]
The main welding heat sources used in the aluminum/steel welding brazing are laser and arc, the welding method which uses the laser as the heat source can achieve high efficiency and accurate welding [13,14]
To improve the wetting and spreading ability of weld pool, Laukant et al [16] used dual-spot laser beam to joined steel plate to aluminum alloy plate, and they suggested that a larger heating area can provide a better back
Summary
Low carbon emission and lightweight design have been concerned by the automobile industry [1]. To improve the wetting and spreading ability of weld pool, Laukant et al [16] used dual-spot laser beam to joined steel plate to aluminum alloy plate, and they suggested that a larger heating area can provide a better back. Using laser welding-brazing to join a 6016 aluminum plate and a low carbon steel plate, Alexandre et al [17] studied the relationship between the tensile strength, and wetting length (L), and wetting angle (θ) They found that a larger L/θ ratio could improve the tensile strength of the joint. To improve the wetting ability of weld pool, we proposed an arc assisted laser welding brazing method. The mechanical properties and fracture behavior of joints at different welding parameters were discussed
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