Abstract
While parts can be repaired via arc welding (AW), it is usually necessary to add some types of excitation method to improve the mechanical properties of the cladded layer. Here, the arc welding‐laser shock forging (AW‐LSF) was used to repair Q235 steel pipes (Fe‐Cr‐C alloy was used as the cladding material). The effects of the welding current (WC), welding speed (WS), and laser shock frequency (LSF) on the geometry and microhardness of the weld bead were studied. The AW‐LSF and AW repair processes were compared. The results demonstrate that the bead width (W) and penetration depth (D) increase with the WC, while the weld height (H) decreases with the WC. The H, W, and D all decrease with the WS; W and D increase with the LSF; and H decreases with the LSF. As the WC increases, the hardness of the fusion zone (FZ) and partial fusion zone (PFZ) decreases significantly, while the hardness of the heat‐affected zone (HAZ) remains nearly unchanged. As the WS increases, the hardness of the PFZ decreases, while the hardness of the FZ and HAZ remains nearly unchanged. With the increase of the LSF, the hardness of the PFZ, FZ, and HAZ increases. Compared with AW, the AW‐LSF can reduce the cladded layer crystal grain size, increase the hardness, and improve the sliding wear resistance.
Highlights
Shafts or tubes are common mechanical parts in industries such as shipbuilding, marine engineering, and offshore wind power. ese parts wear or corrode after a period of use, and corresponding measures must be taken to repair them [1].e use of additive manufacturing technologies to repair parts is a promising field that is gaining increased research attention [2,3,4,5].Arc welding (AW) can be used as an additive manufacturing technology (AMT) to effectively repair damaged parts [6, 7]. is is classified as a directed energy deposition technology, where a metal wire acts as a material feedstock that is melted by an electric or plasma arc [6]
Is article uses an arc welding-laser shock forging (AWLSF) process to repair Q235 steel pipes (Fe-Cr-C alloy is used as the cladding material). e effects of the welding current, welding speed, and laser shock frequency on the geometry and microhardness of the weld bead are studied
An industrial camera was used to observe and measure the weld bead surface and cross section morphology to study the influence of the arc welding-laser shock forging (AW-LSF) parameters
Summary
Shafts or tubes are common mechanical parts in industries such as shipbuilding, marine engineering, and offshore wind power. ese parts wear or corrode after a period of use, and corresponding measures must be taken to repair them [1]. Used AW technologies include gas metal arc welding (GMAW) [8], gas tungsten arc welding (GTAW) [9], plasma arc welding (PAW) [10], submerged arc welding (SAW) [11], and flux-cored arc welding (FCAM) [12]. Each of these has different features and advantages [13]. Is article uses an arc welding-laser shock forging (AWLSF) process to repair Q235 steel pipes (Fe-Cr-C alloy is used as the cladding material). E AW-LSF repair process is compared with the typical AW repair process, and the microhardness, microstructure, and wear properties of the cladded layer are compared to prove the effectiveness of the AW-LSF repair process
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