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开滦林西矿电焊机厂研制的KNH-250x型可控硅直流逆变电焊机,于1988年7月6日由煤炭部技术发展司主持通过了技术鉴定并同意定型批量生产。专家们一致认为,该焊机其性能达到国内先进技术水平。这种用于煤矿井下,以直流架线为电源的中频弧焊机属国内首创。经国家专利局检索,在国际上尚未发现有同类产品。目前该焊机已申请了国家专利并取得了申请号。
Kailuan Linxi mine welding machine developed KNH-250x SCR DC inverter welding machine, on July 6, 1988 by the Ministry of Coal Technology Development Division presided over the technical appraisal and agreed stereotypes mass production. Experts agree that the performance of the welding machine to reach the domestic advanced technology level. This used in coal mines, with DC overhead power supply for the arc welding machine is a domestic initiative. Retrieved by the National Patent Office, in the international community have not found a similar product. At present, the welder has applied for a national patent and obtained an application number.