Page 35 - May

METALWORKING EQUIPMENT AND TOOLS
Table 3.
TIG welding modes with flux cored tape in one pass without preparation of edges.
thickness (mm) welding arc voltages welding speed wire feed argon
current (A) (V) (cm / min) speed (cm / consumption (l
min) / min)
6.0 270 - 280 19 - 20 25 70 - 80 9 - 11
8.0 320 - 330 21 - 22 25 70 - 80 10 - 12

It has also been found that welds produced by welding a Y-groove plate are more prone
to weld defects than non-grooved plates. The presence of a greater number of defects can be
associated with the ingress of oxide inclusions and moisture into the weld metal from the filler
metal, the volume of which increases when welding plates with a Y-shaped groove. In fact, when
welding joints with grooving, in comparison with joints without grooving, the share of the filler
metal in the formation of the weld increases sharply, which causes an increase in the number
of oxide inclusions, pores in the weld metal, and contributes to a change in the mechanical
properties of the joints. Therefore, the use of flux tape is more effective when welding plates
without cutting the welded edges.
Table 4.
Mechanical properties of welded joints of AMg6 alloy made automatic TIG welding of plates
with different preparation of welded edges using conventional and flux tapes.

№ thickness TIG preparing the ultimate ratio bend defects
(mm) welding connection strength σв, σв/σв* angle
method (MPa)σв, (deg.)
(Мпа)
1 with regular without 179 0.6 50 pores and
tape grooving oxide
inclusions
2 with flux 271 0.91 82 -
6.0 tape
3 with regular with Y-shaped 225 0.75 101 pores and
tape groove oxide
inclusions
4 with flux 236 0.79 97 small pores
tape
5 with regular without 178 0.56 89 pores and
tape grooving oxide
inclusions
6 with flux 265 0.84 83 -
8.0 tape
7 with regular with Y-shaped 233 0.74 - pores and
tape groove oxide
inclusions
8 with flux 236 0.75 - -
tape

Note: * - ultimate strength of the base metal (σв): for metal with a thickness of 6 mm - 297 MPa, 8 mm - 315 MPa.
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