Oxidation models of the growth of corrosion products on the intermetallic coatings strengthened by a fine dispersive Al2O3

ReductIon of defoRmatIons duRIng weldIng metal wIRe mesh wIth fRamesThe article presents an issue referring to a reduction of deformation during welding metal wire mesh into the frames. A problem of a possible reduction of deformations was described taking into account characteristics of a construction of a welded element. Technological tests and their results are provided. Technological recommendations relating to the reduction of deformations of the welded element are given.

Section: Possible Options Of An Assemblymentioning

confidence: 99%

Reduction of Deformations during Welding Metal Wire Mesh with Frames

Krawczyk¹,

Słania²

2016

“…Conventional welding methods such as manual metal arc welding (MMAW), gas metal arc welding (GMAW) or submerged arc welding (SMAW) don't provide satisfactory joint properties, especially in a case of steel grades with the yield point beyond 900 MPa. Therefore, steel manufacturers are constantly looking for new solutions in the production process, the methods of forming properties and improve the weldability of modern high strength steels [1][2][3][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Laser Welding of New Grade of Advanced High Strength Steel STRENX 1100 MC

Kurc-Lisiecka¹,

Piwnik²,

Lisiecki³

2017

The article presents results of investigations on autogenous laser welding of new grade STRENX 1100 MC steel. The modern Disk laser was applied for of 5.0 mm thick butt joints welding. The influence of laser welding parameters, mainly the energy input of laser welding on the penetration shape, weld quality, structure and mechanical performance was investigated. It was found that the investigated steel has surprisingly low carbon equivalent CET just 0.328, and also relatively high temperature of martensitic transformation M s at 430.6°C. Despite very rapid cooling times t 8/5 in a range from 0.6 to 1.3 s, thus rapid solidification there was no tendency to cracking of weld metal or HAZ. Significant drop of microhardness in the HAZ resulted in a decrease of tensile strength of joints, compared to the base metal. Impact toughness of test joints was at only 50÷60% of the base metal.

“…In last 20 years main authors created a lot of new technologies in materials science and engineering [1][2][3][4][5]. It has recently been invented low alloy steel welding (only for MIG/MAG processes) with micro-jet cooling [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Generally low-nitrogen and low-oxygen processes give a chance to obtain high amount of acicular ferrite (AF) in low alloy steel WMD that directly corresponds with high impact toughness of weld [1][2][3][4][5]. Having the most optimal inclusion parameters in main welding processes (SMAW, SAW, MIG, MAG) it is only possible to get maximal 55% of AF in weld, but no more.…”

Section: Introductionmentioning

confidence: 99%

Impact Toughness of Steel WMD After TIG Welding

Węgrzyn¹,

Piwnik²,

Stanik³

et al. 2017

The material selected for this investigation was low alloy weld metal deposit after TIG welding with various amount of oxygen in weld metal deposit (WMD). After TIG process it is difficult to get proper amount of oxygen in WMD on the level much lower than 350 ppm. The highest impact toughness of low alloy WMD corresponds with the amount of oxygen in WMD above 350 ppm. In the paper focuses on low alloy steel after innovate welding method with micro-jet cooling that could be treated as a chance on rising amount of oxygen in weld. Weld metal deposit (WMD) was carried out for TIG welding with micro-jet cooling with various amount of oxygen in WMD. In that paper various gas mixtures (gas mixtures Ar-O 2 and Ar-CO 2 ) were tested for micro-jet cooling after TIG welding. An important role in the interpretation of the results can give methods of artificial intelligence.