Spot Welding Galvanized Sheet Metal

Forget the larger 1 8 inch tungsten electrode and use a smaller one.

Spot welding galvanized sheet metal.

Guideline welding conditions are available in standards such as bs1140 british standard specification for uncoated and coated low carbon steel sheet. Don t attempt to weld thin materials like sheet metal with flux cored wires which put more heat into the base metal. That a great deal of spatter will occur. A one step scheme with no pre heating stage and a two step scheme comprising a pre heating stage followed by a main welding stage.

Removing galvanizing from galvanized steel is best accomplished with a hard wheel flapper wheel or grinding disc attached to a grinder. To weld sheet metal with solid wires use electrode positive ep or reverse polarity. When welding the steel that is galvanized the welder has to be set a bit hotter than normal and make sure to give a wiggling movement between the workpieces that are galvanized in order to ensure a good weld pool at the beginning. Combined thickness mild steel two pieces of 20 gauge galvanized.

This portable air cooled spot welder makes quick strong spot welds without having to install a 240 volt outlet. When mig welding galvanized steel the weld puddle is 2550 degrees f. The invention is further directed to a method of effecting spot welds between galvanized sheets which includes the step of interposing between a conductive carrier electrode and the metal surface a. Welding galvanized steel is an important and valuable technique in the metal fabrication process especially when producing galvanized steel wire cloth or galvanized steel gratings but people are shying away from it lately due to the toxic fumes that welding galvanized steel produces.

Welding of the galvanized steel is done similar to the welding of bare metal with a difference of low vaporization temperature in the metals with zinc coating. To weld a tear or split in galvanized steel start on any edge of the metal. Tongs lock firmly onto materials. It should be obvious even to the causal observer that if you put 2550 degree liquid steel over a galvanized coating that boils at 1350 degrees f.

The spot welder has 6 in. Hold the grinder at a 15 degree angle to the metal and make long passes along the weld area with light pressure being applied to the grinder. Weld time and or weld power need to be increased to spot weld galvanized steel. Welding of steel is done at 2550 degrees f.

Welds uncoated mild galvanized or stainless sheet steel to 1 8 in. This study investigated the resistance spot welding rsw parameters for an uncoated mild steel sample and two hot dip galvanized steel samples with different zinc layer thicknesses. Tig welding sheet metal. Two rsw schemes were considered.