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Category: CUTTING

PLASMA CUTTING: AN ADVANTAGE WHEN CUTTING METALS.

One of the most important topics to understand is how to cut metals, for which there are different…

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June 2026

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WELDING PROCESS 14 MATERIALS 12 QUALITY 8 No Catergory 6 INDUSTRIAL SAFETY 6 NEWS 3 CUTTING 1

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1COMPARISON OF COATED ELECTRODES

2# SPATTER IN WELDING: WHY DOES IT OCCUR?

3# WHAT IS THE HISTORY OF WELDING HELMETS? The history of welding helmets is closely tied to the development of welding processes themselves, particularly arc welding, which emerged in the late 19th century. ## Early Beginnings (Late 1800s) When Auguste de Méritens and later Nikolai Benardos and Stanisław Olszewski pioneered arc welding in the 1880s, workers had virtually no eye or face protection. The intense ultraviolet (UV) and infrared (IR) radiation emitted by the electric arc caused severe eye injuries known as **arc eye** or **photokeratitis**, as well as burns to exposed skin. ## First Protective Measures (Early 1900s) The earliest forms of eye protection consisted of simple **tinted glass lenses** held in hand-held frames, similar to the goggles used by glassblowers and foundry workers. These were rudimentary and offered limited protection, forcing welders to hold them in place with one hand while working with the other. As **oxyfuel welding and cutting** (oxy-acetylene) became

4# WHAT TYPE OF SHIELDING GASES TO USE FOR THE GTAW OR TIG PROCESS? The shielding gases used in the GTAW (Gas Tungsten Arc Welding) or TIG (Tungsten Inert Gas) process must be **inert**, meaning they do not react chemically with the weld pool, the base metal, or the tungsten electrode. The most commonly used gases are: — ## **1. Argon (Ar)** – Most widely used shielding gas for TIG welding. – Provides excellent arc stability. – Offers good cleaning action on aluminum and magnesium (when using AC current). – Suitable for welding most metals: carbon steel, stainless steel, aluminum, copper, titanium, and nickel alloys. – Lower ionization potential allows easier arc starting. — ## **2. Helium (He)** – Produces a hotter arc than argon, allowing deeper penetration and faster travel speeds. – Used for welding thicker sections and highly heat-conductive metals such as copper and aluminum. – Requires higher flow rates

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