Steel pressure vessel welding procedure qualification rules should a lot of people are not very clear, look at the following.1, the specimen shall be made in stainless steel composite steel (including primary and stratified) preparation.2, the assessment qualified welding process is suitable for the welding (including parent metal and weld metal thickness range, should according to the specimen thickness of cladding and grass-roots are calculated respectively.3, the assessment qualified welding process is suitable for the welding cladding weld metal thickness range of the minimum value, for the specimen after layer thickness of the weld metal.4, tensile and bending test were carried out, the stainless steel composite steel welded joint (including grassroots, transition of weld and stratified) should be tested, impact test inspection only part of the welded joint at the local level.A) tensile samples should include the full thickness of cladding and grass-roots.B) when the transition an

Tend to exist some shortcomings in the forging process, the following will summarize some for you.1. The large grain sizeLarge grain size is usually caused by a lack of forging temperature and deformation degree, or finish forging temperature is too high, or caused deformation degree fell into the critical deformation zone.Aluminum alloy deformation degree is too big, form texture;High temperature alloys deformation temperature is too low, the formation of deformation mixed can also cause bulky grain, coarse grains will reduce the plasticity and toughness of forgings, fatigue performance significantly decreased.2. Uneven grainUneven grain size refers to the special thick grain forging parts, some parts are small.Produce uneven grain is the main reason of the billet throughout the deformation uneven grain crushing degree is differ, or local deformation degree fell into the critical deformation zone, or high temperature alloy local work hardening, or quenching heating local coarse grains

Casting industry development in our country is in a difficult period, but in the long run, the development of precision casting industry in China still have some hope, there is plenty of room for improvement.It is understood that although the casting industry development in our country is in a difficult period, but in the long run, the development of precision casting industry in China still have room to improve, the market demand has been slowly began to recover, but also add to the strength of the casting industry development in our country has to believe that the casting industry in China industry is bound to achieve gratifying results.To fundamentally improve the level of casting technology it has to do the following four points:First, the development of simulation technology, improve the accuracy of prediction, to strengthen the process control and improve the yield.At present, the problem of regularity to master also is not very well, thus affecting yield in mass production.Secon

Magnetic separator is more and more popular in the mineral processing, with the emergence of more magnetic separation equipment, magnetic separation machine manufacturer's competitiveness is becoming more and more big, henan hongxing mining machinery co., LTD., according to the actual needs of customers, specially designed for the magnetic separator system parts with the same price to build higher yield, economic and practical machinery.My company based on magnetic separation of finished products, how to make magnetic separation issued a uniform thickness of the material, today we in dry magnetic separation machine for example to give customers make a further explanation:1, adjust the gap between the magnetic roller and platePoints plate with magnetic roller spacing is an important parameter in the primary technology, material baffle spacing is smaller, lean magnetite piece is not good, reduces the utilization of mineral resources;Points is the baffle spacing, the greater the gangue mi

Application of full welded ball valve in the heating system what are the benefits, you know?No leakage: the product USES the seamless steel tube forming technology, integrated automatic welding process.Central and valve sleeve joint no leakage phenomenon,Save the flange gasket, reduce the cost of installationZero leakage, 15 years of free maintenance, sealing ring using 25% of the carbon fiber PTFE25 % carbon fiber material and dished spring loaded valve seat structure design, adaptable to changes in temperature and pressure.When ball valve opening and closing times increase sealing surface wear or pipe pressure is not stable, seat free to compensate for the disc spring mechanism, ensure the close coordination of the sealing surface and sphere, ensures zero leakage.Can be buried, buried type welded ball valve can be directly buried underground, well don't have to build tall, just set the shallow Wells on the ground, according to the requirements of the pipeline design, can adjust the l

Application of full welded ball valve in the heating system what are the benefits, you know?No leakage: the product USES the seamless steel tube forming technology, integrated automatic welding process.Central and valve sleeve joint no leakage phenomenon,Save the flange gasket, reduce the cost of installationZero leakage, 15 years of free maintenance, sealing ring using 25% of the carbon fiber PTFE25 % carbon fiber material and dished spring loaded valve seat structure design, adaptable to changes in temperature and pressure.When ball valve opening and closing times increase sealing surface wear or pipe pressure is not stable, seat free to compensate for the disc spring mechanism, ensure the close coordination of the sealing surface and sphere, ensures zero leakage.Can be buried, buried type welded ball valve can be directly buried underground, well don't have to build tall, just set the shallow Wells on the ground, according to the requirements of the pipeline design, can adjust the l

Liner stainless steel compound steel pipe (304 + Q235B) is a new kind of composite pipe material, corrosion resistance, high temperature resistant, high extensibility, high strength etc., are widely used in the new construction and expansion of process pipeline of petrochemical plant.The pipe material the use of the biggest problem is that at the grass-roots level and composite layer of fusion welding problem completely.To get good welding effect, the correct welding method is:1, welding preparationBefore welding will contact layer of paint, clean up dirt and oxide layer, so as to avoid the welding process impurities heat will decompose into H2O and CO2.Even before welding to preheat at the grass-roots level and composite layer.Preheat the electrical heating method, with the center line of the counterpart as a benchmark, on both sides of the wall thickness is not less than three times, and not less than 50 mm, and prevent overheating.2, the welding processWelding compound layer first,

Precision forging technology with high efficiency, low cost, low energy consumption, the advantages of high quality, get more and more widely used in auto parts production.According to the deformation of the metal plastic forming temperature is different, the precision cold forging forming can be divided into cold forging forming, forming temperature, hot forging, hot forging forming, etc.Concrete is:1, the cold forging formingGeneral forming at room temperature, cold forging forgings with high mechanical properties, good surface quality and dimension precision higher advantages, but cold forging deformation resistance is big, the low plasticity, illiquid materials, especially high mechanical strength, is sensitive to cold work hardening material forming difficulties.Has been widely used abroad cold precision forging technology production of low carbon steel, medium carbon steel and low alloy steel parts, by a few grams of weight to more than ten kilograms.Japan and Germany on a car us

Is widely used in modern construction, steel structure, such as gymnasium, factory building, exhibition hall, hotel buildings are more and more used in steel structure.Node is refers to the construction steel structure steel pipe in the intersection, its mechanical performance of the whole steel structure, engineering cost and ease of construction have important influence.Nodes of the casting process is also very important.Cast steel node than welding has many advantages, contrast, use a wider range.Production is difficult, the cast-steel joints, choosing the reasonable casting process is very important.Cast steel node common casting method is:1, the sand mold castingMainly used sodium silicate sand casting process, it can get high quality casting quality, non-toxic harmless, more suitable for the large-scale steel production, the cast-steel joints.But the process generally use wooden modelling, along with the node shape diversification, wooden modelling, core making more difficult, an

A lot of metal in the process of heat treatment, welding seam will send first very good have rust phenomenon, in order to good to continue treatment process, we need to weld rust for the processing of detail, the standard network according to the understanding for the corresponding processing way, and problem solving methods.Weld metal rust treatment:1, pickling without cracks in acid neutralization or with incomplete, phosphating chemical conversion film is not entirely easy to rust.Spread of the coating for a period of time after rust overflow cracks.2, the acid pickling, strong alkaline degreasing process, residue in the cracks of drug after each other and not washed clean.Cracks after dry place with white products.Coating for a period of time, these white products, with the corrosive medium in the air to produce chemical reaction and overflow cracks.Weld metal rust problem solution:1, the weak alkaline degreasing should be used in degreasing, not contain alkaloid, TAL to control at