Stainless Steel

Stainless steel is a steel alloy with a minimum of 10.5% chromium content by mass. In the early nineteen hundreds, metallurgists noticed that chromium had a greater attraction to oxygen than iron did so they added the element chromium to steel. Studies prove that when at least 10% chromium was added, the chrome united with oxygen … Read more

Properties of Metals

Properties of Metals : Definitions All metals fall within two categories, ferrous or nonferrous.  Ferrous metals are metals that contain iron. Ferrous metals appear in the form of cast iron, carbon steel, and tool steel. The various alloys of iron, after undergoing certain processes, are pig iron, gray cast iron, white iron, white cast iron, malleable … Read more

Aluminum (Al)

Aluminum is a lightweight, soft, low-strength metal that can easily be cast, forged, machined, formed, and welded. It is suitable only in low-temperature applications, except when alloyed with specific elements. Commercial aluminum alloys are classified into two groups, wrought alloys, and cast alloys. The wrought alloy group includes those alloys which are designed for mill products … Read more

Tungsten (W)

Tungsten is a hard, heavy, nonmagnetic metal that will melt at approximately 6150°F (3400°C). Uses. Tungsten is used in making light bulb filaments, phonograph needles, and as an alloying agent in the production of high-speed steel, armor plate, and projectiles. It is also used as an alloying agent in non-consumable welding electrodes, armor plates, die and … Read more

Exothermic Electrodes: Cutting Techniques, Cast Iron, Stainless Steel, and Non-Ferrous Metals.

Cast iron, stainless steel, and non-ferrous metals do not oxidize; therefore, underwater cutting becomes a melting process. The exothermic process develops tip temperatures in excess of 10,000 degrees F, which is sufficient to melt these materials with ease. The following technique is recommended: a. Keep the tip firmly buried in the puddle. Using a sawing … Read more

Tool Steels

Steels used for making tools***, punches, and dies are perhaps the hardest, strongest, and toughest steels used in industry. In general, tool steels are medium to high carbon steels with specific elements included in different amounts to provide special characteristics. A spark test shows a moderately large volume of white sparks having many fine, repeating … Read more

Welding Stainless Steel vs Aluminum

The question of Stainless steel vs Aluminum often arises when considering components for a number of applications. Fatigue Strength and Life – Stainless steel** has 5-10 times the fatigue strength (resistance to bending & vibration) of aluminum pipe. The fatigue strength of stainless steel is 25-75,000 psi, compared to aluminum at 6-18,000 psi. Components made of stainless steel … Read more

Trouble Shooting Exothermic Electrodes

Oxy-arc cutting, especially exothermic cutting relies on an unobstructed oxygen flow to be most effective. With inadequate oxygen flow, the rod will burn but not produce the desired cutting effect. Since the actual cutting result is derived from the volume of oxygen reaching the target, any restriction in oxygen flow will decrease efficiency. Symptoms. The … Read more

Alloy Steel

Alloy steel is frequently recognizable by its use. There are many varieties of alloy steel used in the manufacture of equipment. They have greater strength and durability than carbon steel, and a given strength is secured with less material weight. Manganese steel is a special alloy steel that is always used in cast condition. Basic carbon … Read more

Cast Iron

Cast iron is an alloy of iron, carbon, and silicon, in which the amount of carbon is usually more than 1.7 percent and less than 4.5 percent. The most widely used type of cast iron is known as gray iron. Gray iron has a variety of compositions but is usually such that it is primarily perlite … Read more