CAN WE SELECT ELECTRODE BY COLOR OF COATING? WHY WE NEED FLUX COATING ? TYPES OF ELECTRODE COATING?

#welding Electrodes, #coating Welding Electrodes,

Why we need to coat Bare electrodes??

When molten metal is exposed to air, it reacts with oxygen and nitrogen present in the air. As a result, metal oxides form which are detrimental to the integrity and strength of the weld. Hence, it is required to protect the molten metal from this oxidation. In covered electrodes, this protection is provided by the flux coating available on the electrode.

The flux coating burns up due to the heat of the arc and the gaseous products of this combustion envelope the arc – physically keeping out the atmospheric gases. Some of the products get mixed with the molten metal and deposit on the base metal surface. When the molten metal solidifies, these products float to the top and settle down there in the form of slag. The slag protects the still hot metal from oxidation.

The most basic function of the flux covering is to protect the weld metal from the atmospheric gases. Besides this, the flux also contains ingredients that stabilize the arc, influence the amount of spatter generated, influence the depth of penetration of the arc into the base metal, improve the rate of metal deposition, and sometimes even influence the chemistry of weld metal. Further, the bead that emerges when the slag is removed has a uniform smooth appearance.

Colour and content coating for SMAW electrodes:

Electrode color is mostly cosmetic and often results from oxides that become part of the slag system. Don’t select an electrode by its color; confirm the AWS classification and/or electrode name by looking at the printing on the coating. For the curious, colors signify the following:
Red = iron oxide
Green = chrome oxide
White = titanium oxide
Blue = cobalt oxide
Tan = zinc ferrite and iron oxide

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Description: This Video is the second step to get familiar with a Welding Procedure Specification. How It looks, What are the basic components of WPS? Essential Non Essential variables, From where to pick the data? Comparison of the International Qualifying Standards in relation with the WPS Variables. ASME B 31.3, ASME B31.4, ASME B31.8, API 1104 Comparison of the WPS requirements. Discussion of all modules of a WPS taking a sample example.


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