Single-pass Metal Inerte Gaz welding via returne polarity constant current through activating flux layer without preliminary preparation of welding materials.

"MIG Welding Method of Articles from Construction Metals (A-MIG)" - International Patent PCT/UZ99/00002. 1999 (No Publication WO0032345, Date 2000-06-08).

Advantages:

• possibility produce single-pass, square-groove, full penetration welds up to 8 mm without lining;
• decrease in heat effect on structural transformation in the field of thermal influence;
• decrease in welding deformations;
• high productivity;
• reduction in labour input;
• saving on electric energy and welding materials.

Macrostructure of 5086 aluminium alloy welded joints (6-mm-thick) made by MIG welding

Single-pass TIG welding via direct polarity constant current through activating flux layer without preliminary preparation of welding materials.

The flux of mark YC-27À for steel welding was introduced and taken for application by "Ulyanovsk-Energoremont" enterprise (Ulyanovsk, Russia) and "Uzbekkhimmash" works (Chirchik, Uzbekistan) for high pressure tanks welding.

Advantages:

• possibility produce single-pass, square-groove, full penetration welds up to 10 mm without lining;
• decrease in heat effect on structural transformation in the field of thermal influence;
• decrease in welding deformations;
• high productivity;
• reduction in labour input;
• saving on electric energy and welding materials.

Macrostructure of Type 3 carbon steel welded joints (6,5-mm-thick) made by A-TIG welding