A fusion welding method that uses the heat produced by combustible gas in the combustion of oxygen and melts the base metal weld to achieve connection. Gas welding is a welding method using gas flame as heat source. The most widely used is oxygen acetylene flame with acetylene gas as fuel. Because the equipment is…
1. The characteristics of the arc are unique (1) the effect of the weld quality and high melting slag isolation air protection is good, the main component of the arc area is CO2, the nitrogen content and oxygen content in the weld metal are greatly reduced, the welding parameters are automatically adjusted, the arc walking…
In the process of arc welding, liquid metal, slag and gas interact with each other, which is the process of metal re smelting. But due to the welding condition Particularity, the process of welding chemical metallurgy is different from ordinary smelting process. First, welding metallurgy has high temperature, large phase boundary and fast reaction speed.…
Arc: a strong and persistent gas discharge phenomenon. There is a certain voltage between the positive and negative electrodes, and the gas medium between the two electrodes should be. It is in the state of ionization. When igniting welding arc, usually two electrodes (one pole is workpiece, another pole is filler wire or electrode). Through…
(1) to save metal materials, with light weight. (2) to create heavy and complex machine parts by simplifying large and small ones, and simplifying casting, forging and cutting processes. The best technical and economic results are obtained. (3) welded joints have good mechanical properties and sealing properties. (4) it is possible to fabricate bimetal structures…
Copper welding is not hard. The heat required for this type of welding is approximately twice that required for steel of similar thickness. Copper has a high thermal conductivity. To offset this heat loss, a tip one or two sizes larger than that required for steel is recommended. When welding large sections of heavy thicknesses,…
Harm of oversize of weld seam The stress concentration of the butt joint is easily caused by the stress corrosion crack at the toe of the weld, which is mainly caused by the weld height. The stress at the weld toe of the butt joint is the largest. The larger the weld height is, the…
A basic knowledge 1. What is welding? A: two or more materials (allogeneic or xenogeneic), by heat or pressure or both and use, to achieve the bonding between the atom to form The process of permanent connection is called welding. 2. What is arc? Answer: A strong and long-lasting gas discharge phenomenon is called between…
Electric welding is a common name for arc welding. It is a controlled welding operation which is realized by welding electrodes to connect metal parts at high temperature and melting metal parts. However, the resistance of the copper welding rod is very small, so the operation of the welder can not be controlled, so ordinary…
Tin brass is corrosion resistant in fresh water and sea water. It is commonly referred to as navy brass. The tin content of tin brass is 1%, containing too much tin, which reduces the plasticity of the alloy. According to the amount of zinc in the alloy, it is divided into alpha tin brass and…
