Our led lawn light include garden spotlight led lawn light, Garden Spot Light led lawn light, spike light led lawn light. Led Lawn Light Garden Landscape Outdoor Lamp Pathway Spike Spotlight. Led Lawn Light Garden Landscape Park Outdoor Garden Path Lighting Lamp Pathway Spike Waterproof Led Garden Spot Light. Jiangmen Synno Co., Ltd is a high and new-tech enterprise. Our company specialized in LED green light source. And we are engaged in medium and high-end LED decorative lighting with a whole set of design and manufacture of lamps and lanterns, development of control system and engineering supporting service. Our company is devoted to provide customers with LED application products. Synno has got through ISO9001 quality system certification of SGS of Switzerland, CE certification of European Union, GS certification, ROHS certification and relevant domestic LED lamps and lanterns certification.
Garden Led Lawn Light, Garden Spotlight Led Lawn Light, Led Lawn Light Spotlight, Led Lawn Lamp, Garden Light Lawn Lamp Jiangmen Synno Lighting Co., Ltd. , https://www.synnoled.com
Pre-weld cleaning: When welding aluminum and aluminum alloys, the oxide film and oil on the surface of the workpiece's weld and wire must be removed strictly before welding.
Chemical cleaning chemical cleaning, high efficiency, stable quality, suitable for clean welding wire and small size, batch production of the workpiece. Available dip method and scrub method two. Can be used acetone, gasoline, kerosene and other organic solvents to the surface of the oil, with 40 °C ~ 70 °C 5% ~ 10% NaOH solution caustic washing 3min ~ 7min (a little longer but not more than 20min pure aluminum), flowing water rinse, then use The 30% HNO3 solution at room temperature to 60°C is pickled for 1 minute to 3 minutes, rinsed with flowing water, air-dried or dried at low temperature.
Mechanical cleaning: Mechanical cleaning is often used when the workpiece has a large size, a long production cycle, multi-layer welding or chemical cleaning. First use acetone, gasoline and other organic solvents to wipe the surface to remove oil, and then directly use a copper wire brush with a diameter of 0.15mm-0.2mm or a stainless steel wire brush to brush until the metal luster is exposed. Generally, it is not suitable to grind with grinding wheel or ordinary sandpaper, so as to avoid the sand particles remaining on the metal surface, and the defects such as slag inclusion will be generated when welding. In addition, the surface to be welded may be cleaned with a spatula, a file, or the like.
After cleaning, if the storage time is too long (such as more than 24h) should be re-treated.
Pads: Aluminum alloys have very low strength at high temperatures, and liquid aluminum has good flow properties. Weld metals can easily collapse during welding. In order to ensure penetration without collapse, welding pads are often used to support the weld pool and nearby metal. Pads can use graphite plates, stainless steel plates, carbon steel plates, copper plates or copper bars. An arc-shaped groove is formed on the surface of the pad to ensure that the weld seam is formed on the reverse side. It is also possible to weld double-sided molding without single-sided welding of the backing plate, but it is required that the welding operation be skilled or adopt advanced technological measures such as strict automatic feedback control of arc welding energy.
Pre-heating before welding: Thin and small aluminum parts do not generally need to be preheated. Pre-heating before welding can be performed when the thickness is 10mm to 15mm. The preheating temperature for different types of aluminum alloys can be 100°C to 200°C, and the available oxygen-acetylene flame. , electric furnace or torch heating. Preheating can reduce the deformation of the weldment, reduce the porosity and other defects. Post-weld treatment
After welding, the remaining flux and welding slag left behind in the welding seam and nearby will destroy the passivation film on the aluminum surface, and sometimes it will corrode the aluminum parts and should be cleaned. Simple shapes and common parts can be cleaned with simple methods such as hot water flushing or steam blowing. The aluminum parts with high requirements and complex shapes are brushed with a bristle brush in hot water and then immersed in a solution of chromic anhydride or potassium dichromate at a concentration of about 2% to 3% for 60 minutes at about 60°C to 80°C. ~ 10min, and scrubbing with a bristle brush, then washing in hot water, drying with an oven, or drying with hot air, can also be naturally dry.
Post-weld heat treatment aluminum containers generally require no heat treatment after welding.
Aluminum welding standard
Welding methods: Almost all welding methods can be used for welding aluminum and aluminum alloys, but aluminum and aluminum alloys have different adaptability to various welding methods, and various welding methods have their own application occasions. Gas welding and electrode arc welding methods are simple and easy to operate. Gas welding can be used to repair welding thin aluminum plates and castings that do not require high welding quality. Welding electrode arc welding can be used for welding aluminum alloy castings. The inert gas shielded welding (TIG or MIG) method is the most widely used welding method for aluminum and aluminum alloys. Aluminium and aluminum alloy sheets can be tungsten arc argon arc welding or tungsten electrode argon arc welding. Aluminium and aluminum alloy thick plates can be tungsten arc xenon arc welding, argon xenon hybrid tungsten gas shielded arc welding, gas metal arc welding, pulsed gas metal arc welding. MIG welding and pulsed gas metal arc welding are more and more widely used (argon or argon/helium mixture) welding preparation