Abstract
Of particular importance and interest are the effects of pulsed Nd:YAG laser beam welding parameters on penetration and microstructure characterization of DP1000 butt joint, which is widely used in the automotive industry nowadays. Some key experimental technologies including pre-welding sample preparation and optimization design of sample fixture for a sufficient shielding gas flow are performed to ensure consistent and stable testing. The weld quality can be influenced by several process factors, such as laser beam power, pulse duration, overlap, spot diameter, pulse type, and welding velocity. The results indicate that these key process parameters have a significant effect on the weld penetration. Meanwhile, the fusion zone of butt joints exhibits obviously greater hardness than the base metal and heat affected zone of butt joints. Additionally, the volume fraction of martensite of dual-phase steel plays a considerable effect on the hardness and the change of microstructure characterization of the weld joint.
Highlights
The need to reduce fuel consumption and greenhouse gas emissions motivates vehicle manufacturers to utilize lightweight metals with better ductility and strength [1,2]
The samples snap into place clamp with screws along welding sample hasenough been designed ensure stable and and consistent experimental tests
For the of assisted gas ignored at placement
Summary
The need to reduce fuel consumption and greenhouse gas emissions motivates vehicle manufacturers to utilize lightweight metals with better ductility and strength [1,2]. The application of DP steels unavoidably involves welding in the manufacturing process and the properties of welded joints due to the integrity and safety requirements. Such traditional welding methods as resistance spot welding (RSW) [5], tungsten inert gas welding (TIG) [6], metal inert-gas welding (MIG) [7], and gas arc [8,9] have been widely used, the advantages of laser welding are well known: energy efficiency, slight heat-affected zone, little heat input per unit volume, and deep penetration [10]. In some cases a proper filler material may be demanded when an interfacial gap attends to be filled [12], autogenous welding is still one of the most common forms of laser welding
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