Page 33 - May

METALWORKING EQUIPMENT AND TOOLS

between the liquid metal of the weld pool
and the strip. The influence of the use
of flux tape and the thickness of the
flux on the value of the sagging of the
weld penetration (hprop.) Of the AMg6
alloy is shown in Figure 6. The results
obtained show a decrease in the sagging
of the weld penetration, in comparison
with welding without backing, by several
a b times. The thickness of the flux applied
to the belt has almost no effect on the
Fig. 3. Macrostructure of welded joints of alloy AMg6 (thickness 6
mm), made according to standard technology (a) and using flux tape amount of sagging.
(b). Also, studies were carried out of
the influence of various TIG welding
methods (Figure 7) on the relative length
of oxide inclusions (Δo.v.) and the value
of the sagging of the weld penetration
(hprop.) in the welds of the AMg6 alloy.
In accordance with the results obtained,
the use of a conventional tape as a
backing in welding effectively reduces
the sagging of the weld penetration,
but contributes to an increase in oxide
a b inclusions in the weld metal. In addition,

Fig. 4. Macrostructure of welded joints of alloy AMg6 (thickness 8 the use of a flux applied in the form of
mm), made according to standard technology (a) and using flux tape a paste from the side of the weld allows
(b). you to clean completely the weld metal
from oxide inclusions, but it does not effectively reduce the sagging of the weld penetration.
The most effective method in TIG welding on the formation and quality of welds of the AMg6
alloy is the use of a flux tape, which contributes to the complete removal of oxide inclusions and
a sharp reduction of the sagging of the weld penetration.
Table 2.
TIG welding modes without flux cored tape in two passes with Y-piece cutting edges.

thickness pass welding arc voltages welding wire feed argon
(mm) number current (A) (V) speed (cm / speed (cm / consumption (l
min) min) / min)
6.0 1 140 - 150 11 - 12 25 - 8 - 10
2 220 - 230 16 - 17 25 110 - 120 9 - 11
8.0 1 160 - 170 13 - 14 25 - 8 - 10
2 206 - 270 18 - 19 25 110 - 120 9 - 11

Stanochniy park 33