Effect of Increase of Current Intensity on Creating Possibility of TIG Soldering Speed in Aluminum Alloy to Steel Connection
Mousavifar, S.A., Bani Mostafa Arab, N.
According to this matter that the connection of diverse metals such as AL 5A06 with 660º melting point and steel SU 321 with 1385º melting point with different thermal features like the expansion coefficient and conductivity for the connection in the fusion welding conditions causes the creation of internal pressure after the welding. Then, the connection of these two kinds of metal, despite its necessity and specific application by the fusing method, would be resulted in considerable breakdown and impairments; so, the method of soldering (arc welding) was applied with inert Argon-based shielding and with Pulse TIG machine with developed technology and application of cover of plating Zn on SU 321 and producing the galvanized steel on the steel SU 321 and for the reason of increase of the speed of soldering operations with being lower of the current intensity, the formation of the tiny fines at lower surfaces of the weld pool would be faced with difficulty. So, for the increase of formation of tiny fines instead of coarse fines, the progressive increase of current strength according to the increase of soldering speed is one of the factors of formation of the tiny fines. So, it can be said that the current intensity is a factor effective on providing the condition for creating the TIG soldering speed in the connection of AL 5A06 and SU 321.
Galvanization: cover of aluminum on steel, AL 5A06: aluminum alloy
Progressive increase: staircase increase, SU 321: stainless steel, Pulse: pulsed.