In TIG welding, the arc burns between the workpiece and a non-consumable tungsten electrode. To protect the electrode and molten pool from oxidation, both are shielded with an inert gas, generally argon. This welding process is suitable for all fusion-weldable metals. The type of current, polarity and shielding gas used depends on the base metal. … Read more
Gas metal arc brazing (GMA brazing) is an alternative method for joining primarily thin (t < 3.0mm) sheets that have been coated for corrosion protection. This method offers considerable advantages over GMA welding since an alloy metal with a lower melting point than the base metal is used as filler metal. Lower heat input Less … Read more
MIG welding of aluminium can be performed in the short, spray or pulsed arc. The advantages of the pulsed technique are that spatter formation is reduced and a wire electrode with the next largest diameter can be used. The larger diameter wire is easier to feed and, at an identical melt-down rate, has a smaller … Read more
The shielding gases used for stainless steels differ from those used in GMA welding of unalloyed steels since they contain much less active gases, such as oxygen and carbon dioxide. This is necessary to prevent excessive oxidation of the passive layer responsible for the corrosion resistant properties of these metals. It is important to remember … Read more
The collective term ‘structural steel’ refers to unalloyed and low-alloyed steels, fine-grained structural steels that are suitable for welding mild steel. The choice of the most suitable shielding gas depends mainly on the type of filler metal, the material thickness and surface condition of the base metals, the degree of mechanisation, working position, arc type … Read more
Abstract In fabrication or construction, the goal is higher product quality with improved performance. This is especially important with relation to the GMA and TIG welding processes. I have heard many people comment to me that shielding gases only protect the welding arc from atmospheric attack while this is partly true, shielding gases do much … Read more
