CUTTING ELECTRODE

Sodel 512Plus electrodes can be quickly and easily cut, chamfer, gouge and pierce parts made of steel, cast iron, copper, etc. With this electrode you can make holes of varying diameter, depending on diameter of the electrode itself and the intensity of the current used. The advantage of using this electrode is that, unlike the carbon electrode process, you do not need an air compressor to blow out the melted metal. The electrode can be used with a DC or AC welding station. It will contaminate the base metal much less than a standard carbon gouging electrode. To make a … Continue reading CUTTING ELECTRODE

WELDING COPPER ALLOYS

General Copper alloys are used for a wide range of applications. They can be found in architectural de corations, household appliances, the electronics, marine, and chemical industries, etc. Such popularity is due to their excellent electrical and thermal conductivity, high corrosion resistance, easy formability and good tensile strength and fatigue limit. Other characteristics, such as their spark resistance and distinctive color put them in a special family of alloys. Classification Copper is often alloyed with several types of metals. The most common alloy elements are aluminum, nickel, silicon, tin and zinc. Other elements are also added in small amounts to … Continue reading WELDING COPPER ALLOYS

BRAZING

General Brazing is a thermal method for permanently joining metallic parts. Brazing operations are characterized by the fact that the edges of the pieces to be joined are never brought to the liquid state. For this reason, the base metal must always have a higher melting point than the filler metal. Brazing is used to assemble hard to reach joints that are too difficult to weld. For thin pieces, brazing has a clear advantage since the thermal energy required for brazing is relatively low. Peak temperatures are therefore fairly low, thus keeping distortion and reduction of the piece’s mechanical properties … Continue reading BRAZING

BETTER UNDERSTANDING STEEL FOR ITS WELDING

Carbon steels are steels containing up to 2% carbon plus some other elements, most of which are present in small amounts, except for silicon (0,6%) and manganese (up to 1,6%) which are needed to de-oxidize the weld pool. These steels are also referred to as non-alloy steels. Carbon steel can be found in many applications since it is easy to shape, machine, weld and is very economical. In addition, its mechanical properties can easily be altered through various heat treatment processes (annealing, normalizing, hardening, etc.). Alloy steels contain significant amounts of alloy elements other than carbon, plus frequently-allowed amounts of … Continue reading BETTER UNDERSTANDING STEEL FOR ITS WELDING

The features and weldability of Nitronic alloys

Nitronic alloys, as their name suggests, consist of a series of nitrogen-bearing austenitic stainless steels. The company Armco Steel before this registered trademark (trade name) becomes the property of AK Steel since 2000 developed the first grade, namely Nitronic 40, in 1961. The chemical composition of the main alloys of this series is presented in the table below. CHARACTERISATION Nitronic have quite different properties than those of austenitic stainless steels such as usual grades (e.g. 304, 316L, CF3, CF8M, etc). Thus, the typical properties of these alloys are presented below : very high mechanical strength with a ratio strength/density of … Continue reading The features and weldability of Nitronic alloys

STAINLESS STEEL AND THEIR WELDABILITY

General Stainless steels are steels alloyed with chromium to improve their corrosion resistance in different environments. Chromium in the stainless steel oxides easily but the thin oxide layer that forms is corrosion resistant, durable and stable. It forms a barrier that prevents corrosive products from oxidizing the alloy (see stainless steel 1 diagram). To be considered stainless, a steel must contain a minimum of 10% chromium. AISI stainless steel classification method SERIES CATEGORY MAIN ALLOY ELEMENTS TEMPERED MAGNETIC 2XX Austenitic Cr-Ni-Mn No No 3XX Austenitic Cr-Ni No No 4XX Ferritic Cr No Yes 4XX Martensitic Cr Yes Yes 5XX Martensitic … Continue reading STAINLESS STEEL AND THEIR WELDABILITY

WELDING OF TOOL STEEL

General The steels used to manufacture tools usually contain high amounts of alloy elements. These elements are added to improve properties specific to their working conditions through cutting, forming, stamping, rolling, extruding or other operations. The main alloy elements employed are carbon, manganese, chromium, molybdenum, tungsten, vanadium, silicon, cobalt, copper and nickel. Classification The classification method used by both the AISI (American Iron and Steel Institute) and the SAE (Society of Automotive Engineers) is the most widely used system for distinguishing the various tool steels. This system is based either on the quenching medium or the working conditions. The following … Continue reading WELDING OF TOOL STEEL

PART 2 :WELDABILITY OF ALUMINUM ALLOYS

The various series of aluminum alloys are all weldable, but some variants of the 7XXX series are more difficult to weld due to their high tendency to cracking. Generally, the operational weldability of aluminum is good; however, certain precautions are necessary when welding aluminum. The family of aluminum alloys that are easiest to weld are the 1XXX, 3XXX and 5XXX series in which no heat treatment has been applied. The 6XXX series can be welded readily, but welding reduces their mechanical properties. The high-strength 4XXX and 2XXX series are weldable, but special precautions must be taken. In the 7XXX family, … Continue reading PART 2 :WELDABILITY OF ALUMINUM ALLOYS

PART 1 : TYPES OF ALUMINUM AND THEIR CHARACTERISTICS

General Aluminum used to be considered unweldable because of its refractory oxide layer (alumina). Later on, a flux (stripper) was used to remove the alumina, thus enabling gas welding of aluminum alloys. Through electronic stripping, it is now possible to weld aluminum using the GTAW process or even with coated electrodes. Aluminum can readily be welded these days, and it is easy to create a high-quality, good-looking bead using the SMAW, OFW, GTAW or GMAW processes. Classification There are a wide variety of aluminum alloys. They are usually classified according to the Aluminum Association Alloy Number for wrought alloys. The … Continue reading PART 1 : TYPES OF ALUMINUM AND THEIR CHARACTERISTICS

PART 3 : CAST IRON WELDING METHOD

To minimize heating of the piece, the smallest possible diameter electrode should be used for the first passes that are in contact with the cast iron; 3/32 inch (2.5 mm) electrodes are best for this purpose. Similarly, you should select the lowest current setting possible that will provide good wetting and perfect adhesion. Adhesion is often enhanced by using alternating current. Avoid weaving the electrode when welding; direct the arc into the weld metal to minimize dilution; and make beads a minimum of 3/4 to 2 inches (20 to 50 mm) in length. The beads should be peened with a … Continue reading PART 3 : CAST IRON WELDING METHOD