Manual stainless steel welding (MMA)
Manual stainless steel welding is a very common and easy-to-use stainless steel welding method. The length of the arc is adjusted by hand, which depends on the size of the gap between the electrode and the workpiece. At the same time, when used as an arc carrier, the electrode is also a weld filler material.
This stainless steel welding method is simple and can be used to weld almost any material. For outdoor use, it has good adaptability, even it is no problem to use it underwater.In electrode welding, the arc length is determined by the human hand: when you change the gap between the electrode and the workpiece, you also change the length of the arc.In most cases, direct current is used for welding, and the electrodes act as both the arc carrier and the weld filler material.The electrode consists of an alloy or non-alloy metal core wire and an electrode coating. This layer of coating protects the weld from air and stabilizes the arc. It also causes the formation of a slag layer and protects the weld to shape it. Electrodes can be either titanium or alkaline, depending on the thickness and composition of the coating.Titanium welding rod is easy to weld, the weld seam is flat and beautiful, and the welding slag is easy to remove.If the electrode is stored for a long time, it must be rebaked, because the moisture from the air will quickly accumulate in the electrode.
Key points and precautions for welding stainless steel flux cored wire:
(1) Use a flat characteristic welding power supply, and use reverse polarity for DC welding. Welding can be done with a general CO2 welding machine, but please loosen the pressure of the wire feed roller slightly.
(2)The protective gas is generally carbon dioxide gas, and the gas flow rate is preferably 20~25L/min.
(3) The distance between the welding tip and the workpiece should be 15~25mm.
(4) Dry elongation: 15mm is suitable when the welding current is below 250A, and about 20~25mm is more suitable when the welding current is above 250A.
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