Difficulties Aluminum welding aluminum and aluminum alloy aluminum alloy material easily oxidized. In the air, the aluminum oxide Gansu Earthquake easily combined with equipment boxes, generating a dense aluminum oxide film (thickness of about 0.1-0.2μm), high melting point (about 2050 ℃), far more than aluminum and aluminum alloys melting point (about 600 ℃). Alumina density 3.95-4.10g / cm3, aluminum is approximately 1.4 times the surface of the aluminum oxide film of easy absorption of moisture, welding, it prevents fusion of the base metal, easy to form pores, slag, No fusion defects, performance degradation caused by welding. Flight Case [Toolbox maintenance knowledge 1. Recommendation Before each storing leather Xinjiang Earthquake instrument case should go for it do to clean up dust. Leather products generally best to the cortex through the maintenance of oil Sichuan earthquake instrument case, first wipe the oil on a clean cloth, then wipe the surface evenly, avoiding the oil directly applied on the surface to avoid damage to the leather. 2. Napi products received the cupboard must be ventilated. Leather own natural oils over time the longer or use too many times and gradually reduce vibration equipment boxes, so that even very advanced leather also need regular maintenance. Trolley can be hand can also drag, we usually use the trolley wheels are basically at the bottom of the box, but modern man has devised a new form of rod boxes, the boxes designed as a cylindrical shape, the wheel entire outsourcing outside the box, this cylinder design makes this trolley can better adapt to different terrain, such as the box can be easily pulled directly up and down stairs. Earthquake instrument case manufacturers | shockproof carrying case | Shin Hae package provided by Xiongxianshenhai packaging color Limited. Xiongxianshenhai packaging color Limited (www.shenhai6688.com) (www.shenhai6688.com) strong, credible, in Baoding plastic industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Shin Hae packaging and you hand in hand into the brilliant, for a better future!