The rebuilding technologies are used to develop surface of ladle. Among many welding methods currently used to obtain surface layer
without defects one of the most effective way of rebuilding is using metal arc welding. This additional material gives more possibilities to
make expected quality of rebuild surface.
Chemical composition, property and economic factors allow to use metal wire. Because of these reasons, solid wire gives opportunity to be
wildly used as material to rebuild or repair the surface in different sectors of industry.
The paper shows a few ways to rebuild the surface in the massive cast with the use of metal active gas welding for repair. The work
presents studies of defect in the massive cast. It contains the pictures of microstructures and defects. The method of removing defects and
the results of checking by visual and penetrant testing methods are shown. The paper describes the methodology of repair the ladle with
metal active gas welding, preheating process and standards nondestructive testing method.
The surfacing technologies are used for constitution of protection layer against wear and is destined for obtaining coating with high
hardness. Among many weldings methods currently used to obtain the hard surface layer one of the most effective way of hardfacing is
using flux cored arc welding. This additional material gives more possibilities to make expected hard surface layer.
Chemical composition, property and economic factors obtained in flux cored wire are much richer in comparison to these obtained with
other additional materials. This is the reason why flux cored wires give possibilities of application this kind of material for improving
surface in different sectors of industry.
In the present paper the imperfection in the layers was used for hardfacing process in different situations to show the possible application
in the surface layer. The work presents studies of imperfection of the welds, contains the picture of microstructures, macrostructures and
shows the results of checking by visual and penetrant testing methods.
The welding technologies are widely used for design of protection layer against wear and corrosion. Hardfacing, which is destined for
obtaining coatings with high hardness, takes special place in these technologies. One of the most effective way of hardfacing is using self
shielded flux cored arc welding (FCAW-S). Chemical composition obtained in flux cored wire is much more rich in comparison to this
obtained in solid wire. The filling in flux cored wires can be enriched for example with the mixture of hard particles or phases with
specified ratio, which is not possible for solid wires. This is the reason why flux cored wires give various possibilities of application of this
kind of filler material for improving surface in mining industry, processing of minerals, energetic etc. In the present paper the high
chromium and niobium flux cored wire was used for hardfacing process with similar heat input. The work presents studies of
microstructures of obtained coatings and hardness and geometric properties of them. The structural studies were made with using optical
microscopy and X- ray diffraction that allowed for identification of carbides and other phases obtained in the structures of deposited
materials. Investigated samples exhibit differences in coating structures made with the same heat input 4,08 kJ/mm. There are differences
in size, shape and distribution of primary and eutectic carbides in structure. These differences cause significant changes in hardness of
investigated coatings.
The paper presents the capabilities of welding techniques to creating properties of wear resistant high chromium cast iron alloy. The use
of the right kind of welding sequence allows you to change the structure and properties of the obtained welds. Tests were conducted for
one type of additive material in the form of self shielded core wire. In order to determine the effect of the type of welding sequence on the
properties of welds performed welding using string bead and weave bead. The resulting weld was tested on hardness and research structure
in an optical microscope. In the following studies have been made erosive tests wear of made hardfacing. String beads gave structure rich
in carbides and harder about 270 HV of the weld with weave bead. Also, wear resistance was nearly twice as better for welds made with
string beads. In the experiment a decisive role in the resistance to wear plays a high hardness of the deposit and the presence of carbides in
its structure. Changes in the basic parameters of the deposition process allows for the formation of structure and properties of hardfacing
welds in a wide range.