Figure 9 shows the macrostructure of welded samples joined with different welding currents
. As is seen in this figure, an increase in FZ diameter and width with the welding current
is in the range of 8-12 kA.
Such a structure is typical for all investigated welded joints under different welding current
. Also, it has been observed that in all cases in the FZ there are different sizes of porosity.
is very important in the process and must be adequate to the wire speed feed .
Typically, the controller software will implement features such as pulsing the welding current
, providing variable frequencies, and providing timing as needed for implementing automatic spot-welding; all of these features would be prohibitively expensive to design into a transformer-based machine, but require only program memory space in a software-controlled inverter machine.
The welding factors examined in this study included welding current
, voltage, and travel speed as shown in Tables 2 and 3:
Symbol Property Value Unit V Welding voltage 24 [V] I Welding current
160 [A] [d.sub.wire] Wire diameter 0.0012 [m] V Torch speed 0.0037 [m/s] [v.sub.wire] Wire feed speed 0.066 [m/s] Q Gas flow 4.17 x [10.sup.-6] [[m.sup.3]/s] Table 3: Thermocouples positions in the workpiece.
3D weld pool surface reconstruction is a key problem in producing intelligent welding machines, and this process is able to obtain optimal welding parameters, such as welding current
, speed, arc length, etc.
The home workshop grade welders make spots only about 1/8" diameter with extremely low tip pressures and only 1000 to 1500 amps welding current
Kakiuchi at all  claim that increase of electron beam welding current
increase the amount of cracks on the grain boundaries.
The quality of the output welding current
and voltage of a GMAW power source has an important influence on the dynamic behaviour of the GMAW process and on the quality of the welded product.
In order to examine the influence of enhanced convection via cryogenic cooling on the microstructure and sensitization resistance of the HTHAZ adjacent to the weld interface three different heat input conditions were considered at a welding current
of 90 A and welding speeds of 1, 2.5, and 3.5 mm/s, respectively, using a constant arc voltage of 30 V.