Page 32 - May

METALWORKING EQUIPMENT AND TOOLS

Table 1.
Chemical composition of aluminum alloys AMg6 and 1561.

element Cu Mg Mn Zn Fe Si Ti Be Zr
AMg6 0.1 5.8 – 6.8 0.5 – 0.8 0.2 0.4 0.4 0.02 – 0.0002 – -
0.1 0.005

Δо.в = Σlо.в./lшва.
Also, an assessment was made of the effect of flux tape on the value of the sagging of the
weld penetration hprop. (see fig. 2).
This indicator makes it possible to judge the quality of the formation of the weld penetration,
i.e., the smoothness of the transition from the penetrated metal to the base metal, which can
affect the mechanical characteristics of welded joints, especially under dynamic loads. The lower
the value of the penetration sagging, the smoother the transition from the penetrated metal
to the base metal and the better the quality of formation of the penetration of the weld. The
smoothness of the transition of the penetration
of the welded seam affects the operational
characteristics of welded joints of structures
and products, especially those operating under
dynamic loads. In addition, X-ray inspection,
metallographic studies and mechanical tests
of welded seams and joints of the investigated
aluminum alloy were carried out.
Figures 3 and 4 show the macrostructures
of welded joints made during TIG welding of
plates made of AMg6 alloy 6 and 8 mm thick
using standard technology (see Figures 3a and
4a) and using flux tape (see Figures 3b and 4b) Fig. 2. Diagram of the weld seam (W - seam width,
with various types connections (with and without H - metal thickness, hprop. - sagging of the weld
groove welded edges). In the course of studies penetration).
of the effect of flux tape on the features of the
formation and quality of welds of the AMg6 alloy, their dependence on the thickness of the
applied flux layer on the surface of the tape was revealed. Figure 5 shows the dependence of the
relative length of oxide inclusions (Δ o.v.) in the welded joints of the AMg6 alloy on the thickness
of the flux (s) applied to the tape. According to the data obtained, the welded seams of the
AMg6 alloy are most effectively cleaned of oxide inclusions when the thickness of the applied
flux is in the range of 0.3 - 0.4 mm. In the case of using a flux with a thickness of less than
0.3 mm, although the amount of oxide inclusions is reduced, it is insufficient for their complete
removal. With a flux thickness of more than 0.4 mm, the quality of welding decreases due to the
formation of gaseous emissions resulting from the evaporation of the flux components formed

32 Stanochniy park