Welding material standard or product samples listed on the Welding Supplies consumables deposited metal (excluding the base metal) performance, while the welding Connector performance depends on the weld metal (including welding; material deposited metal and base metal), and welding, any welding materials in the welding process can change its performance in heat affected zone of welded joints, only consider the selection of welding materials, weld metal properties in order to ensure the welded joint properties needed welding process (especially post-weld heat treatment, the line energy) with the The provisions of the JB/T4709-2000 the principle "the performance of the weld metal should be higher than or equal to the lower limit of the standard specified value of the parent material or conditions of the technical requirements to meet the pattern requirements" as the selection of welding materials policy: JB/T4709-2000 the GB divided into 150 low alloy steel according to the use of performance strength low-alloy steel, heat-resistant low-alloy steel and low-temperature low-alloy steel, such a division of fact and their welding characteristics compatible. Some people think that by Welding Material qualification to determine the welding material, "this argument is not comprehensive - for example, welding 16MnR steel, the following electrode through welding procedure qualification: J506, J507, J507R J507G, J507RH, J507DF ... but welding products which grades will have to consider many factors, such as: (1) from the welding equipment to consider, J506 use the AC welder, J507 and DC welding machine; consider â‘¡ from the crack resistance J507RH better than J507; inside the container welding from the labor protection J507DF (low dust) is superior to J507; consider â‘£ improve efficiency iron powder electrode J507Fe than 507. After considering the above factors ultimately determine the electrode grade
The most common lanthanum Welding Electrodecontaining three percent of lanthanum oxide (La203), known as lanthanum oxide. In Europe and Japan, Lanthanum tungsten electrode in most applications has been the most commonly used alternative Cast Iron Electrodes 2% of the containing lanthanum oxide, lanthanum oxide 1.5% and three kinds of lanthanum oxide 1%. Three lanthanum oxide has the lowest electron work function, the arc is the easiest, lowest tip temperature, which helps prevent grain growth and enhance the service life. Lanthanum tungsten electrode containing La 2% of test that: If the overload current longer life than the thorium tungsten arc easier for most use. Especially good at
(A) to prevent thermal shock,
(B) short cycle welding repeat the ignition, welding
(C) to avoid contamination. Welded pipes, welders of this lanthanum tungsten electrode is particularly satisfactory.
Long service life, reduced downtime. Moreover, in normal circumstances, 1.5% lanthanum oxide, lanthanum tungsten electrode, low current, easy arc starting and stable low-current arc. Lanthanum in the tungsten electrode is a rare earth, and no radioactivity. Sale and use in the United States, Europe and Japan, but has been providing Beijing Solton Tungsten & Molybdenum Technology Co., Ltd. from 1993 to this lanthanum tungsten electrode. Lanthanum tungsten electrode is mainly used for DC welding, welding in the exchange will have good results. Lanthanum tungsten electrode containing 1.0% lanthanum oxide and cerium tungsten electrodes in the market.