Welder Qualification Test (Part 6).
It is necessary to clearly understand the difference between the terms «attestation» and «certification» relating to testing for welders. When we say that the w...
Author: Ivan Perfilyev
The current density distribution, temperature and gas flow velocity in the real welding arc (Part 2).
Therefore, the drop which is in an arch column because power lines of current can’t sharply change the direction, has to make noticeable change to distrib...
The lack of side fusion.
The lack of side fusion arises because of small current, high welding speed, low-quality deseaming after the performance of the previous layer. The lack of side...
The hardness measurement. The Rockwell hardness test method (Part 1).
The method of determining the Rockwell hardness includes numerous embodiments of the same principle as the Brinell, but using indenters with several diameters. ...
The polymorphic transformations in metals (Part 4).
The growth rate Up of the new modification crystals depends on overcooling. With increase in overcooling ΔT the difference of chemical potentials Δμ grows and U...