How to judge the competitiveness of parts and components enterprises Judging the competitiveness of parts and components companies is more complicated than judging the competitiveness of vehicle companies. Vehicle companies directly face consumers, and relatively speaking, they compete in a common market. Therefore, product development capabilities, manufacturing capabilities, marketing capabilities, and capital accumulation capabilities together constitute the competitiveness of the entire vehicle company. Parts companies do not directly face consumers and the market division is relatively clear. Therefore, to compare the competitiveness of parts and components companies, we must consider different markets. "Now China's mini-vehicle and economy car market is very large and may be larger in scale in the future. Foreign auto parts companies may not be involved in this area at all. Therefore, in this area, of course, domestic enterprises are highly competitive." Li Zanfeng It is considered that judging the competitiveness of auto parts companies is inaccurate. He said: “In some areas, especially in the high-end and high-end products, domestic parts and components companies are not as good as foreign companies. But in the low-end products with low added value, the competitiveness of domestic parts and components companies is higher than For foreign companies, a company specializing in the production of micro-car axles has produced more than 800,000 units this year, which is currently the largest axle and axle manufacturer in the world and under 1 ton and a half. Can you say that it is weak in competitiveness?†China's auto parts market In recent years, China's auto market has developed rapidly and this year's auto production will exceed 8 million. Li Zanfeng said: "In the development process of China's auto market in recent years, the contribution of economic vehicles in the field of passenger vehicles has continuously increased, and the rapid development of commercial vehicles is also inseparable from the contributions of independent brands. In these two areas, Chinese auto parts companies are dominant." It is not difficult to find that the reason why Chinese auto parts companies can dominate in the low-end product market is because many foreign companies do not involve this field. He explained: "Foreign companies withdraw from this field because the added value of the products is too low to bear this burden and risk. In the long run, if we only regard automotive products as mechanical manufacturing products, then the competitiveness of foreign auto parts companies Should be a decline.The automobile industry will sooner or later take the path of the household appliance industry.Products with relatively low added value will gradually be transferred out of developed countries, but the auto industry has more influence than the home appliance industry, so the state generally will not give up easily. This industry." Submerged arc welding (SAW), as the name suggests, is conducted beneath a protective layer or blanket of flux. As the arc is always covered by the layer of flux, it eradicates any sort of radiation from the exposed arcs and also necessity of welding screens. With two variants of the process, automatic and semi-automatic, is one of the widely used welding process used in the process industry. Venus wire, one of the renowned Submerged Arc Welding Wire suppliers in India, illustrates the principle and uses of sub arc welding. Let us see them what they are: Alloy Steel Submerged Arc Welding Wires Alloy Steel Submerged Arc Welding Wires,Submerged Arc Welding Wire Changzhou Edaweld Trading Company Limited , http://www.edaweld.com
Process:
Akin to MIG welding, SAW also employs the technique of formation of an arc between the weld joint and the continuous bare electrode wire. A thin layer of flux and slag are employed to generate protective gas mixtures and to add the required alloys to the weld pool respectively. As the weld proceeds, the electrode wire is released at the same rate of consumption and the excess flux is sucked out through vacuum system for recycling. Apart from shielding the radiation, flux layers also are highly beneficial in avoiding heat loss. The excellent thermal efficiency of this process, around 60%, is attributed to these flux layers. Also SAW process is absolutely free of spattering and does not require any sort of fume extraction process.
Operating procedure:
Alike any other welding procedure, the quality of the weld joints with respect to penetration depth, shape and chemical composition of the weld metal deposited are usually controlled by the welding parameters such as current, arc voltage, weld wire feed rate, and weld travel speed. One of the drawbacks (ofcourse methods are available to counter them) is that the welder cannot have a look on the weld pool and hence the quality of well is entirely dependent on the operating parameters.
Process parameters:
As mentioned earlier, it is only with the process parameters, a welder perfects the weld joint. For instance, in an automated process, the wire size and flux that employed that are suitable for the joint type, thickness of material, and size of the job plays an important role in deciding the deposition rate and bead shapes.
Wire:
Depending upon the requirement of deposition rate and travel speeds following wires can be selected
Twin wire
Multiple wire
Tubular wire
Metal powder addition
Single wire with hot addition
Single wire with cold addition
Flux:
Granular mixture of oxides of several elements such as manganese, titanium, calcium, magnesium, silicon, aluminium, and calcium fluoride are widely used as flux in SAW. Usually the combination is selected such that it provides the intended mechanical properties when it combines with the welding wire. It should also be noted that the composition of these fluxes play a vital role in the operating arc voltage and current parameters. Based on the welding requirement, primarily two types of fluxes, bonded and fused are employed in the process.
Uses:
Every welding method has its own set of applications, which usually overlaps due to scale of economy and quality requirement.
Although SAW can be very well employed for both butt joints (longitudinal and circumferential) and fillet joints, it has few minor restrictions. Owing to the fluidity of the weld pool, slag in molten state and loose layer of flux, butt joints are always carried out in the flat position and on the other hand, fillet joints are done in all positions – flat, horizontal, and vertical.
It should be noted that as long as proper procedures and selection of parameters for joint preparations are carried out, SAW can be successfully carried out for material of any thickness.
It can very well be deployed for carbon steels, stainless steels and low alloy steels and also few non-ferrous alloys and materials, provided the ASME code suggested combinations of wire and flux are used.
SAW finds a permanent place in heavy machine industries and ship building industries for welding heavy sections, large diameter pipes, and process vessels.
With very high utilization of electrode wire and easy automation possibilities, SAW is always one of the most sought after welding process in manufacturing industry.