The method of welding copper is gas welding, manual carbon arc welding, manual arc welding and manual argon arc welding. Large structure can also be welded by automatic welding. (1) copper gas welding. The most commonly used butt joints for welded copper are lap joints and T-joints. Two kinds of wire can be used in…
This is a kind of welding method that takes resistance heat as energy source, including electric slag welding with slag resistance heat as energy source and resistance welding with solid resistance heat as energy source. Resistance welding is usually a welding method to connect the contact surface between two pieces of the workpiece under the…
Laser welding is the welding of laser beams generated by high-power coherent monochromatic photon streams as heat sources. Such welding methods usually include continuous power laser welding and pulsed power laser welding. The advantage of laser welding is that it does not need to be carried out in vacuum. The drawback is that the penetration…
Electron beam welding is a method of welding heat generated by concentrated high-speed electron beam bombardment of the workpiece surface. In electron beam welding, electron beam is generated and accelerated by electron gun. Commonly used electron beam welding are high vacuum electron beam welding, low vacuum electron beam welding and non vacuum electron beam welding.…
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…
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…
