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Main contents include: welding safety technology, welding theory, structure and principle of manual arc welding equipment, operation methods of continuous arc welding and arc extinguishing, all position welding (flat welding, flat fillet welding, vertical flat welding

Welding methods: welding methods are generally divided into fusion welding, pressure welding and brazing according to different heating and pressurization conditions during welding. Fusion welding is to heat the metal at the joint of weldment to molten state during welding

The steel grades of 16MnR and 160Q2 with good weldability are selected for the penstock of the Three Gorges Project, and gas shielded welding is the preferred welding method. Solid wire gas shielded welding should be popularized in the prefabrication plant, and flux core should be popularized on the basis of experiments

The structural conditions and service conditions of the product shall be as close as possible. When the crack resistance test method is selected, the actual situation of the product joint shall be as close as possible. For example, if the product joint is butt joint

At present, during welding and cutting operations, oxygen is obtained by the following methods: (1) The pressure of pipeline transportation (painted blue) is 0.5Mpa~1.5Mpa. The safety devices are complete, the pressure is stable, and it is economical.

The experimental steel is high-strength bridge steel with a plate thickness of 20mm, and its main chemical composition (mass fraction,%) is 0.12C, 0.40Si, 1.50Mn, 0.0097P, 0.0085S, 0.042Nb, 0.184Mo

When the welding position is in the flat welding position, the welding current that is too large can be selected. When welding in horizontal, vertical and overhead positions, the welding current shall be 10%~20% less than that of flat welding. Fillet welding current is higher than flat welding current

Gas shielded welding is divided into solid wire and flux cored wire. They have some common characteristics, such as heat concentration, high efficiency, and also have differences (see below). Gas shielded welding has become the welding of carbon steel and low-alloy high-strength steel

Welder technology: normalizing 1. The heat treatment process of heating the steel to 30 ℃~50 ℃ above AC3 or Acm, holding it for an appropriate time, and cooling it in still air is called normalizing

The process parameters of manual arc welding in electric welding The welding process parameters (welding specifications) refer to the physical quantities selected to ensure the welding quality during welding. 1. Selection of welding rod type and brand

In the welded joints of high-strength bridge steel, the crack growth resistance of the weld is the highest, followed by the heat affected zone, and finally the base metal. The fatigue fracture mode of weld is mainly transgranular fracture, and the fracture mode of base metal

Pipe, boiler and pressure vessel welding class: 3 months (if you have the foundation or the ability to accept it, you can complete it in advance and graduate in advance) Learning content: Boiler, pipe and pressure vessel welding special class (high-pressure welder

The selection of welding layers When welding thick plates, multi-layer welding or multi-layer multi pass welding must be adopted. The previous weld bead of multi-layer welding preheats the next weld bead, and the latter weld bead preheats the previous weld bead

The electric welding operation is observed and conducted under the mask. As the vision is not clear and the working conditions are poor, to ensure the welding quality, it is necessary not only to have more skilled operation skills, but also to be highly concentrated

Before welding, the surface of the test piece shall be strictly cleaned, the test piece shall be placed flat and supported at both ends overhead, and the following welding materials and parameters shall be used for welding; Welding rod diameter is 4mm, welding current Wie（

The working principle diagram is similar to that of a transformer, and can't be drawn here. Suggestions for becoming a good welder 1 First of all, there are more than one hundred welding methods, mainly manual electric welding (that is, welding electrodes

Electric welding is a welding operation that uses welding rod to melt the place where metal parts need to be connected through high temperature arc. Its working principle is: through the common 220V or 380V voltage

Zibo welding training enrollment ensures that students learn excellent technology! There are CO2 gas shielded welding, argon arc welding, blanking fitter, electric welding junior class, electric welding senior class, electric welding full section class

Preparation of carbon steel welding rod The model of carbon steel welding rod is composed of four digits of the letter "E". The letter "E" indicates welding rod; The first two digits indicate the minimum tensile strength of deposited metal, carbon steel electrode

Pipe, boiler and pressure vessel welding class: 3 months (if you have the foundation or the ability to accept it, you can complete it in advance and graduate in advance) Learning content: Boiler, pipe and pressure vessel welding special class (high-pressure welder