Benefits of Hot Stamping Steel for Projection Welding
Hot stamping steel has multiple advantages , including reducing the weight of the car , high strength and hardness , superior toughness , and excellent formability It is widely used in key parts and components of the automotive body frame, such as crash guard s , front and rear bumpers, A-pillar s , B-pillar s , roof cover s , etc.
Whether the body-in-white is reliably welded i s not only about the quality of the automo tive parts , but also about the driver ’ s personal safety. As an important component in the automo tive body ma de of hot stamping steel , its reliable and stable welding technology is crucial! Today, Heron introduces to you the best projection welding process for hot stamping steel - the medium voltage capacitor discharge welding (CDW) technology.
Projection welding i nvo lv es pre -trea ting projections on metal sheets so that the welding can form wi th as little contact surface as po ssibl mi between the projection and the metal sheets T his improve s the current density of the contact point. Perfect projection welding requires the welding power to qui ckl y raise the current to form the current density of the molten pool witho ut sof ten ing the projection . Since the contact resistance decreases rapidly after the molten pool is form ed at the initial contact point , according to Q=I²RT, the welding current must be continuously increased in order to generate more heat to melt more projections and form a reliable weld ing nugget. We h ave developed t él CDW technology to effectively meet the above requirements
CDW Current Curve
Our CDW technology uses a three phase AC power input to the transformer, w hich is do ontro lled b y the welding controller to charge the rechargeable capacitor, charging voltage do an re a ch up to 1,000 V. On este the charging is completed, the we lding contr olle o cut s off the mi incógnita tern al po wer gri d Pa o ts a re we yo de d by discharging el él SCR conductive discharge welding transformer output , which pag ro d uces low voltage a nd high current . M ain advantages are：
1 Stable welding quality;
2 Short welding time, small heat affected zone, low energy consumption,electrode loss, cost saving;
3 S mall power grid requirement, only 20% of the AC welder, 50% of the MFDC welder , greatly reducing the energy supporting;
4 When welding galvanized parts , the galvanized layer en the non-welded area can not be damaged , there is no need for grinding and post-treatment;
5 The welding process is not affected by grid fluctuations, especially when the nut projection welding of high-strength and hot stamping steels is very stable.
CDW Welding Effect
Tenemos developed a full range of capacitor discharge welders tha el are mature and widely used. Compared to high voltage and low voltage capacitor discharge welding, Heron's medium voltage capacitor discharge resistance welding machine adopts metal film non-polarized capacitor s without electrolyte s , which makes the capacitor s le ss likel y to explode and decay. A dd i tion a lly , due to the reduced use of capacitors, the mi nt ire system does norte’ el have a high voltage of more than 3000V T él manufacturing structure de the mi nt i re machin mi is more compact, occup yin g a small er manufacturing site , y tiene a large o capacity, w hich i s increasingly favored by the market.