The use of commercially available filler metals for wire and arc additive manufacturing (WAAM) duplex stainless steel components results in a microstructure with very low ferrite content. ferrite–austenite ratio the weld metal depends on both cooling rate particularly chemical composition. However, research testing special deposition welding using processes is time-consuming expensive. This paper describes method that uses an additional cold feed gas (GMAW) process to selectively vary alloy...

Abstract This study aims to investigate the impact of various surface conditions prior welding on susceptibility materials cold cracking, including an analysis fracture surfaces. Additionally, a novel method is introduced for quantifying presence diffusible hydrogen using thermal desorption (TDA). allows determination concentration in thin sheet welded joints without use consumables. Three different cold-rolled Advanced high-strength steel (AHSS) samples with conditions, such as coatings,...

Abstract In previous works, it has been found out that the electrode displacement in resistance spot welding a high potential to be used as measurement factor monitor joint quality and subsequently optimize parameters. By extracting characteristic points curve, is possible create evaluate different parameter sets predict formation of expulsion. These include for example maximum electrodes, time displacement, indentation weld hold time, or velocity electrodes. work, was already shown showed...

This work gives an insight into the transient softening at fusion boundary of resistance spot welds on hot stamped steel. Metallographic investigations and hardness mapping were combined with finite phase–field modeling phase evolution boundary. Saturation weld nugget growth in welding process was observed. For industrially relevant, long times, a is therefore isothermally soaked between peritectic solidus temperatures. leads to carbon segregation liquid due higher solubility possibly δ-Fe...

Abstract The influence of arc energy and filler metal composition on the microstructure additively welded thin-walled structures duplex stainless steels was investigated using different commercially available standard superduplex solid wire electrodes commonly used today. As welding process, cold transfer (CMT) process used. cooling rate were varied by adjusting feed speed. Optical emission spectroscopy (OES) carrier gas melt extraction (CGME) to determine chemical specimens. ferrite content...

In this study, different techniques are applied to measure diffusion coefficient D of three cold-rolled Advanced High-Strength Steels (AHSS): CR700Y-980T-DH, CR780Y980T-CH, and DR700Y980T-DP, their laser-welded counterparts. By thermal desorption analysis (TDA) the hydrogen transport at elevated temperatures is investigated. This method allows measurement quantities trapping sites enables determination activation energies Ea pre-exponential coefficients D0. The conducted under various...

Abstract Compared with conventional steels, press-hardened steels an aluminium-silicon coating have a smaller welding range, which is resulting in reduced process stability. For this reason, analytical methodology required, can optimise the parameters and extend range significantly. Consequently, most publications focus on variation of time current at constant electrode force. This paper deals design force profile to improve weldability joint quality. The basis for investigation...

Direct energy deposition with arc and wire (DED-AW) is a versatile, low-cost, energy-efficient technology for additive manufacturing of medium- large-sized metallic components. In this study, the effects shielding gas in cold metal transfer (CMT) welding walls blocks on cooling time, mechanical properties, macro- microstructure have been studied using precipitation-hardenable Ni-based superalloy Haynes® 282®. The consequently rate were varied by changing feed travel speed. As expected,...

Abstract The increasing use of hot stamped high strength steels like 22MnB5 (1.5528) for complex crash relevant structural components in the vehicle body, and problem hydrogen-assisted damage have gained importance automotive industry. In category, quenched tempered (tensile up to 1600 MPa) are under unfavorable conditions potential risk hydrogen embrittlement, e. g., at elevated input, presence increased tensions, further processing these steels. Peculiarities boron-alloyed steel coating...

Press hardened structural components are a key factor in lightweight car design and thus reducing vehicle mass while increasing crash safety. The use of quenched 22MnB5 (Usibor 1500) has been established hot sheet forming for the production safety-relevant body components. In order to expand field application press-hardened components, process-reliable joining technique is essential. Ultra-high-strength can be joined with other parts bodies using resistance spot welding process. Here,...

A missing test methodology that allows for the determination of delayed cracking susceptibility laser welds high-strength sheet steel is presented. Unlike other cold crack testing methods, this based on a self-restraint specimens welded from thin materials without welding consumables and external loading. The potential procedure with sample geometry, clamping device documentation cracks described. It shown position weld specimen critical parameter to increases increasing edge distance. in...

Due to their positive properties, AMC materials represent a current trend in industrial applications and thus major research focus. But currently difficult machinability limits full establishment. Therefore, suitable joining processes are needed which allow targeted punctual use of the AMC-materials minimize machining effort. This paper presents feasibility study direct material bond between an AlSi10MnMg-alloy reinforced 30 Vol.-% with silicon carbide particles adequate monolithic by using...