Technology of welding hard wearing plates

Abstract

The technology of welding of abrasion-resisting plates with the use of different filler metals designed for providing high wear resistance of the top layer and good plastic properties of the parent material is presented. To this end, we made test joints which were subjected to metallographic examination, mechanical testing, hardness measurements and testing of wear resistance of the type metal–mineral in accordance with ASTM G65-04 standard. In each case, the weld joining the wear resistant layer was made with the use of an XHD 6710 covered electrode. For making the weld joining of the parent material of the abrasion-resisting plate, we applied austenitic and ferritic–perlitic filler materials in the form of covered electrodes and solid wires for gas shielded arc welding. The tests have shown that the XHD 6710 electrode can be used for joining of top layers of abrasion-resisting plates providing their high wear resistance. For interpasses and filler passes, it is recommended to use austenitic filler metals which are characterized by very good plastic properties. Moreover, they reduce the mixing ratio of the weld metal and the material of the abrasion resistant layer.