Precision Weldarc Ltd Park Street, KOLKATA, West Bengal

We are the leading manufacturer and supplier of Submerged Arc Welding wires, Mig welding wires and SAW Flux and all types of welding machines in the weld arc industry and are fully equipped with all essential machines and equipments to meet production, inspection, testing and storage needs.

SAW Flux. SAW Fluxes are manufactured from mineral constituents in two main form: fused and agglomerated. Agglomerated fluxes are a mixture of selected, finely crushed minerals from natural sources, partly heattreated before manufacturing and metallic ingredients. all constituents are intimately dry mixed and bonded with either potassium silicate or sodium silicate to a wet mixture. This mixture is pelletized and formed to grains in special equipments such as mixer and granulation unit. After baking and screening to the proper grain-size, the flux is ready for testing and packaging. 1. Brief Introduction and points for attention. SAW agglomerated fluxes owns perfect welding technological characteristics, steady are nice welding formation and easy in slag removing. NO smoke or smell produced in course of welding, perfect in rust and blowhole resistance. Except PWL-601, all can be operated with AC or DC. Loose packed SAW agglomerated fluxes can be recycled due to its small specific gravity, so the consumption can be much more less than fused flux (above 20%) Since suitable amount of alloy element can be added to SAW agglomerated fluxes, with the combination of suitable welding wires, it can be widely adopted in the important welding operation of boilers, preseure vessels, chemical industry containers, nuclear power plant, bridges, ships, oil gas pipelines, steel structured houses, oil rigs, etc 2. Guidelines of choosing SAW fluxes and Wires Before application, only a certain understanding of the material of welding pieces, specifications of welding equipments and welding consumables, as well a suitable combination method can guarantee the quality of finished welds. Normal carbon steel and low alloy shall adopt equal strength welding wires and the fluxes to be chosen accordingly in consideration of structure form of work pieces, steel plate thickness (high or low handness), working conditions (dynamic or static load conditions), rapture resistance properties and other requirements. If good plasticity, high impact toughness, satisfied low temperature properties, and strong rapture resistance are required, the high alkalinity fluxes shall be applied, like: PWL 7101, PWL 7101q, PWL 7102, PWL 7105q, etc. If good welding technological characteristic, easy in slag removing, nice welding formation, suitable plasticity and impact toughness are required, acidic agglomerated fluxes shall be adopted, like: PWL 5101, PWL 5101m, PWL 5103 (KF385), etc. If special requrements are necessary for working pieces, like mining equipments, wearing resistance items, etc., the fluxes shall be selected accordingly, like PWL 4102, PWL 4103, PWL 4105. For neutrality ones, PWL 8101special shall be applied which gives excellent resutls for spiral pipes for water pipe lines. For stainless or figured steel welding, PWL 6101 can be selected.

Metal Inert Gas (MIG) welding or Metal Active Gas (MAG) welding is a semiautomatic or automatic arc welding process in which a continuous and consumable wire electrode and a shielding gas are fed through a welding gun. A constant voltage, direct current power source is most commonly used with GMAW, but constant current systems, as well as alternating current, can be used. There are four primary methods of metal transfer in GMAW, called globular, short-circuiting, spray, and pulsed spray, each of which has distinct properties and corresponding advantages and limitations. Originally developed for welding aluminum and other non-ferrous materials in the 1940s, GMAW was soon applied to steels because it allowed for lower welding time compared to other welding processes. The cost of inert gas limited its use in steels until several years later, when the use of semi-inert gases such as carbon dioxide became common. Further developments during the 1950s and 1960s gave the process more versatility and as a result, it became a highly used industrial process. Today, GMAW is the most common industrial welding process, preferred for its versatility, speed and the relative ease of adapting the process to robotic automation. The automobile industry in particular uses GMAW welding almost exclusively. Unlike welding processes that do not employ a shielding gas, such as shielded metal arc welding, it is rarely used outdoors or in other areas of air volatility.