Narrow gap multi-pass laser butt welding of explosion welded CP-Ti/Q235B bimetallic sheet by using a copper interlayer

In this research, Al/Cu lapped joints with a thickness of 02 mm were joined via nanosecond pulsed laser welding The influence of laser scanning paths on the weld formation, microstructure and bonding strength was investigated Sound weld formations were produced when the outer spiral laser scanning path was used Porosities and cracks were easily formed in joints produced by concentric circle and straight laser scanning paths due to the interval duration between the neighboring welding processes The interfacial morphology was a wave structure when the laser scanning paths were an outer spiral and concentric circle, and continuous interfacial intermetallic compound (IMC) was formed at the interface θ–CuAl2 was generated in the vicinity of the Cu substrate, while α-Al + θ–CuAl2 was generated in the outer region and the weld seam When a straight line laser scanning path was adopted, the wave structure disappeared Discontinuous IMC and cracks were also produced at the interface The tensile-shear load results indicated that the outer spiral laser scanning line was the most beneficial for the bonding strength of the joint and could reach up to 198 N A satisfactory weld formation, the pinning effect due to the wave structure at the interface and continuous interfacial IMC all contributed to its highest bonding strength

Effect of the scanning path on the nanosecond pulse laser welded Al/Cu lapped joint

The welding process is used by almost every manufacturing industry at some stage of production or in the repair and maintenance of equipment. Understanding the choices available in term of the welding process, materials, and associated limitations and costs would empower the engineer and welder to make informed decisions for specific applications. This chapter presents a general overview of typical welding defects, their characteristics, and implications. In addition, welding defects in several industries and applications are also presented to highlight the commonly used welding techniques and their associated flaws.

Welding Defects and Implications on Welded Assemblies

We focused on the microstructure, mechanical properties, and bonding characteristic of rolled pure tungsten (PW) and W-1.0 wt.%La2O3 (WL10). WL10 exhibited higher microhardness and bending strength despite lower density compared to PW. Charpy tests showed that WL10 displayed higher absorbed energies compared to PW at the same test temperatures, and the delamination fracture appeared at 873 K for WL10 while 1073 K for PW. However, the excellent mechanical properties of WL10 did not lead to high bonding strength when it was bonded with CuCrZr alloys. The shearing and bending strength are 122.26 and 183.91 MPa, lower than 198.69 and 215.27 MPa of PW. The difference of thermal–physical properties between tungsten and La2O3 caused the cracks near the interface, resulting in lower bonding strength of WL10.

Microstructure, mechanical properties and bonding characteristic of deformed tungsten

https://open.library.ubc.ca/media/download/pdf/52383/1.0305858/5

3-D multi-scale modeling of deformation within the weld mushy zone

Effect of Ti on hot cracking and mechanical performance in the gas tungsten arc welds of copper thick plates

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Effect of Ti on hot cracking and mechanical performance in the gas tungsten arc welds of copper thick plates