PRODUCT REVIEWS
Robot welding with new LMR 2 torch generation
The new LMR 2 high-performance torches by Lorch offer new performance dimensions in robot welding with various innovations .
“ Robots are now able to weld even more precisely with torches developed specifically for automated welding . Their optimal contact tip cooling and gas coverage make them particularly economical during use . With the new torches , corresponding hose packages , the wire feed and the power source , we offer a precisely coordinated overall solution to warrant maximum efficiency for all robot systems ,” Lorch told ISMR .
With long duty cycles , precision in the repeat rates and fast material throughput , robot welding poses particularly high demands for welding . With its new LMR 2 torch generation , available for all common robot types , Lorch Schweißtechnik is offering a welding system with various innovations that have already been implemented on the new LMS hand-held torch system .
“ The specially designed torch interior sees coordinated shapes of the contact tip and contact tip holder making the gas flow laminar to ensure perfect gas coverage . The drawn contact tip counteracts the formation of micro arcs in the inner contact tip while the special design adds a wire-straightening effect and optimises current transfer to the wire . The highly stable arc and improved material transition make weld seams more precise . Temper colours when welding stainless steel are minimised as well , and fume and soot are also reduced when welding aluminium ,” added Lorch .
Above : The new LMR 2 torch by Lorch Schweißtechnik . Below : A cooling system protects the welding torch from overheating and reduces throughput of wear parts .
The special design of the brass tip adapter / gas diffuser enables quick heat discharge and protects from too-high thermal stress at long runtimes . The shielding gas routing provides additional cooling of the contact tips and optimises gas flow at the front end of the torch .
“ Consistent implementation of coppercopper connections and highly efficient cooling clearly reduce the overall resistance in the torch . Both greatly protect the installed wear part components and increase their service lives . Gas-saving , separate shielding gas routing and the repair-friendly design help to increase sustainability . The hose packages and their connections to the torch can be replaced easily and the wear parts in the LMR torch are mostly identical with those in the LMS torches from manual welding . This reduces warehousing of wear parts if robot systems and manual welding systems are both used in the same company ,” explained Lorch .
The LMR 2 torches are available in two versions , TN 3 and TN 6 . The TN 3 torch is equipped with a long torch neck and is suitable for production processes where good access to the weld seams is important e . g . when welding thin sheets in the automotive industry . The power range of the TN 3 ranges from 300-450 amperes , depending on cooling ( water , gas ). The high-end torch TN 6 , with its shorter torch neck , is designed for higher currents of 300-500 amperes . Sixteen different performance packages can be selected as complete solutions , depending upon robot concept , wire feed option , cooling method and torch version .
The LMR 2 torches can be combined with any common robot system and the Lorch S-RoboMIG XT and Robo-MicorMIG power sources . The power sources make the SpeedPulse XT , TwinPuls XT , SpeedArc , SpeedArc XT , Pulse and TwinPuls Lorch welding processes available for robot welding .
Lorch Schweißtechnik GmbH is a leading manufacturer of arc welding systems for industrial applications as well as for use in automation with robots and collaborative robot systems . In-house developed helmet and torch systems are also part of its product portfolio . n
The new torch and complete packages by Lorch are compatible with common robot systems .
JULY / AUGUST 2023
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