It is the world's foremost ideal automatic roller welder.



Outstanding Features of MRW-F

The wire feeder handles wire of 2.8mm to 4mm (7/64"-1/8"-5/32") in diameter at a wide feed rate of range of 0 to 2,286mm per minute. You can choose the most suitable wire size and feed speed according to sepcific application.

The welding head has a hopper for supplying flux and a drive motor actuated by a remote control switch to adjust its vertical position (stroke about 500mm). And also for easy setting and to achieve good welding, a tilting device of forward-backward and right-left hand direction is installed.

Extra wide welding station is capable of rebuilding even the largest idler with bracket. The welding station can be easily tilted up to 90 degrees counterclockwise and 45 degrees clockwise. As the opening of the welding station is very wide, even 2 pieces of the front idlers of Caterpillar D8 tractor or Komatsu D155 tractor can be mounted and flanges of two idlers can be welded at a time, this helps you save time and labour costs.

The internal water cooling device developed by Maruma permits crack-free, ideal welding. This process eliminates disassembling and assembling of rollers and idlers and minimises the parts to be replaced, reducing the cost remarkably.

Automatic move-over system provides stringer welding bead pattern and forms beautiful and even bead. Move-over is automatically done at the range of 1.6mm to 32mm. It can be precisely set at any point in the whole range of the carriage beam.

Automatic oscillation welding across the heavily worn tread surface of a roller is very economical. This system eliminates continual slag removal and allows one man to operate 2 or3 units of welding machines at the same time.

The power unit has DC 650A, 100% duty cycle output. The new type of thyristor controls it.

Pack turn-table is provided which carries pack containing 250kg or 500kg of wire. Wire reel is also available as an option.

The solid-state module operator control console is designed for reliability in any climatic condition. All the switches on the board are arranged in welding order so that even an inexperienced operator can easily operate it. Welding pattern is immediately shifted to stringer bead welding or to oscillation bead welding with the adoption of the newest mode selection system.

Recently welding specifications have become very severe as new metals are used in rollers. In such case, welding should be done at the temperature specified in order to obtain a good welding effect. The temperature of the internal cooling water can be strictly controlled to meet these requirements.