Arc welding

About: Arc welding is a research topic. Over the lifetime, 25393 publications have been published within this topic receiving 168182 citations.

The wear behavior between hardfacing materials

Abstract: Hardface weld cladding in industry most commonly uses cobalt-based STELLITE nos. 6 and 12 and nickel-based Colmonoy nos. 56, 83, and 88 for plasma transferred arc (PTA) welding of 4140 steel. Frictional and abrasion wear of weld layers are compared with that of the widely used nitridized, low-level SKD61, SACM1 steel alloys and with centrifugal-cast nickel-based Colmonoy No. 68 bimetal. Experimental results show that cobalt alloys are not suitable for low-alloy steel frictional wear. However, nickel alloys are quite compatible. Resistance to abrasive wear increased in the experimental materials according to the level of hardness. Wear resistance was compromised in experimental materials when the hard phase was too dispersed.

Laser roll welding of dissimilar metal joint of zinc coated steel to aluminum alloy

Abstract: There is a subject to reduce the weight of car body by replacing steel to aluminum alloys as some structural body parts for improving fuel consumption and suppressing CO2 generation As one of the solutions, the hybrid body structure concept using aluminum alloys and high strength steels is proposed recently However, it is well known that fusion welding of steel and aluminum is difficult due to the formation of brittle intermetallic compounds at the joint interface Therefore, new welding processes by which these dissimilar materials can be joined in high reliability and productivity are demanded “Laser roll welding” has been developed for joining of dissimilar metals by Kutsuna, Rathod, and Tsuboi in 2002 (Japanese Patent No 3535152 and No 3692135) Controlling the formation of the brittle imtermetallic compounds was tried by application of laser roll welding to get a sound joint In the present work, laser roll welding of zinc coated steel and aluminum alloy was fundamentally investigated, and the p

Closed-Loop Control of Robotic Arc Welding System with Full-penetration Monitoring

Abstract: The real-time detection of the state of the gap and weld penetration control are two fundamental issues in robotic arc welding. However, traditional robotic arc welding lacks external information feedback and the function of real-time adjusting. The objective of this research is to adopt new sensing techniques and artificial intelligence to ensure the stability of the welding process through controlling penetration depth and weld pool geometry. A novel arc welding robot system including function modules (visual modules, data acquisition modules) and corresponding software system was developed. Thus, the autonomy and intelligence of the arc welding robot system is realized. Aimed at solving welding penetration depth, a neural network (NN) model is developed to calculate the full penetration state, which is specified by the back-side bead width (Wb), from the top-side vision sensing technique. And then, a versatile algorithm developed to provide robust real-time processing of images for use with a vision-based computer control system is discussed. To this end, the peak current self adaptive regulating controller with weld gap compensation was designed in the robotic arc welding control system. Using this closed-loop control experiments have been conducted to verify the effectiveness of the proposed control system for the robotic arc welding process. The results show that the standard error of the Wb is 0.124 regardless of the variations in the state of the gap.

Residual welding stresses in laser beam and tungsten inert gas weldments of titanium alloy

Abstract: The residual welding stresses in laser beam (LB) and tungsten inert gas (TIG) weldments of a titanium alloy in thin plate form were investigated experimentally in the present work. A hole drilling technique was used to measure the residual stresses in the weldments. The effects of the welding method and post-weld heat treatment (PWHT) on the residual stresses were analysed. The results show that (i) the residual stress distribution in the LB welded joints is similar to that obtained for traditional fusion welding processes, although the distribution zone is much narrower in LB welding, (ii) the residual stress in the heat affected zone for LB welding is about 100 MPa lower than that for TIG welding, and (iii) PWHT in vacuum greatly relieves the welding residual stress.