Welding wire is very important
Welding wire is very important
With the extensive use of efficient welding processes, shipbuilding has become increasingly demanding on welding materials. However, according to many domestic shipbuilding enterprises, the quality of ship welding materials in our country is mixed with different standards and the problems caused by the forced repair and repair of ships under construction due to welding cracks are becoming more and more serious. For the most part, this has also become one of the major reasons for the passing rate of China's shipbuilding enterprises once their welding rate is significantly lower than that of Japan and South Korea's shipping companies. In this regard, the shipping industry should pay attention and attention to promote the welding material manufacturers to actively improve product quality, promptly reverse the adverse situation.
Nowadays, semi-automatic carbon dioxide welding, automatic carbon dioxide welding, double wire carbon dioxide welding, vertical gas welding, automatic carbon dioxide fillet welding and other efficient welding process is adopted by many domestic shipping companies. As these high-efficiency welding processes are gradually being popularized, carbon-dioxide flux-cored wires gradually replace traditional solid-state welding wires and become the main force of ship welding materials with a utilization ratio of about 70%. According to the introduction of the welding expert Zhao Zhong in Guangzhou CSSC Longxue Shipbuilding Co., Ltd., the flux cored wire itself has the characteristics of high efficiency, low spattering and stable droplet transition. However, it is puzzling for the shipbuilding enterprise welding technicians that the flux cored wire is in the production process The frequency of problems is getting higher and higher, the use of more and more poor. A common phenomenon is that when the current is greater than 180 amperes, there are microcracks in the weld after trying many brands of flux cored wire, and the current will be bigger or even cracked. In fact, the problem of flux cored wire is by no means a case. According to a shipping company reaction, the purchase of 4000 tons of cored wire rigorous re-examination found that there are problems in the wire had to return as high as 1,600 tons. During the period 2009-2010, the quality of the flux cored wire once caused many shipbuilding enterprises in China to be forced to rework due to collective welding cracks.
So, what causes inefficient welding materials inefficient? First of all, wire manufacturers rush into mass production, the surge in quantity, in order to survive the quality of low-cost disorderly disorderly competition is the main reason for the mixed flux cored. According to insiders, at present, the share of flux cored welding wire in ship welding materials is the largest and the market prospect is considerable. Therefore, more and more manufacturing enterprises are involved in the field and the competition is fiercer and fiercer. As a result, Price war. However, the cost of the material itself is very high, the price cuts are not realistic, in order to achieve the purpose of price reduction is still profitable, many companies adjust the content of alloying elements in the formula, resulting in wire technology performance, mechanical properties have changed . Second, the supervision of ship inspection agencies lax. At present, classification societies generally only accept factory approval of welding wire manufacturers, and apply for inspection certificates for a type of wire formula of an enterprise. However, in the actual production and sales process, the wire manufacturer has a lot of different formulations of the wire, and even the same batch of the same manufacturer of flux cored wire performance will be different. Finally, the shipping company re-inspection lax. Strictly speaking, the flux cored wire into the plant must go through the performance test of shipping companies approved to pass, once the wire technology performance and mechanical performance evaluation of non-compliance should be returned. However, many shipping companies believe that the wire can be used as long as there is a certificate of inspection, no reinspection, leading to the problem of wire into the shipbuilding link.
Welding wire quality problems will increase the cost of welding the shipping companies, such as welding quality problems lead to rework, the greater the loss of shipping companies. Therefore, at present, China's shipbuilding enterprises facing the problem of wire materials should be effectively resolved. In this regard, relevant experts said the emphasis is to strengthen self-regulation and supervision. Wire production enterprises should be soberly aware that the industry health sustainability exhibition, companies can not win market reputation by opportunistic, but should strengthen management, increase research and development efforts to reduce costs and improve the quality of the flux cored wire, thus obtaining the approval of shipping companies. For regulatory issues, on the one hand, industry associations, classification societies and other agencies and government departments should conduct a centralized examination of the problems existing in the welding material production enterprises, clarify the key points and responsibilities of management and supervision, and increase supervision and control. On the other hand, while relying on external supervision, the shipping enterprises themselves should strictly monitor their production. Each welding wire of the manufacturer of the welding wire should be strictly evaluated for the welding process performance and test welding, and then the procurement list should be established. On this basis, the shipbuilding enterprises should strengthen the re-inspection of the incoming welding wire, reject the bad faith enterprise and the unqualified welding wire.