TPT November 2017

WE LD I NG

Multi-process welder range from Helvi DURING the recent international trade fair Schweissen & Schneiden 2017, Helvi SpA introduced the new Maxitech range. Designed with inverter technology, the new 3ph multi-process welding machine range includes compact units and models with separate wire feeders. 2T/4T spot function selection; pre- post gas time regulation; electronic reactance; soft start; burn back time; hot start; slope down; and crater filler. TIG DC features include lift arc; continuous and pulsed welding; 2T/4T;

and current and final current up/down slope regulation. The MMA selection features anti-sticking, and adjustable hot start and arc force. An optional interface can be installed to enable use of spool gun or push-pull torch, with analogue or digital control. The user can save and recall more than 200 working points and store them in a customised job list. A USB interface enables easy updating, with the possibility to extract welding data. For Maxitech 380-500 models, from the separate wire-feeder the user can set all the parameters up to a distance of 100m from the power source. The Maxitech range is suitable for professional use, medium-light work- shops, metallic furnishings fabrication, industrial and automotive body shops, shipbuilding and piping.

The large 3.3" display shows all the welding parameters and makes their setting easy and intuitive. The units are equipped in standard configuration with MIG/MAG manual and synergic, MMA and TIG processes (plus gouging for the 500-amp version). The CAN bus technology allows the power source to be expanded with optional single pulse, double pulse and root welding functions. In synergic/pulsed MIG/MAG welding, the microprocessor allows quick and easy setting of the programs, ensuring optimal arc stability and high welding quality. MIG/MAG features include continu- ous, pre-set synergic/pulsed curves; storage of custom welding settings;

Helvi SpA – Italy Fax: +39 0444 75 00 70 Email: info@helvi.com Website: www.helvi.com

Maxitech 355C welding inverter

Monitoring of weld purge up to 1km away WHEN welding lengths of tube and pipework fabrications, as well as sections of pipelines of 20m length and more, one problem operators face is not receiving a fast and true weld purge reading from the purge zone. PurgeNet™, a networking device designed for communicating the current oxygen reading from the monitor to another piece of equipment, such as the visual warning accessory PurgeAlarm™ or a dew point monitor with additional inter-pass temperature monitoring. weld purge site. The sensor is secured in a small module that is mounted inside the purging system and is connected to the measuring instrument by a data cable. The purge reading is quickly sent back to the instrument, so operators and quality control personnel know immediately when the purge is satisfactory.

The PurgEye ® 1000 weld purge monitor from Huntingdon Fusion Techniques (HFT) makes it possible to have an immediate reading of the weld purge gas at the underside of the joint, from any distance up to 1,000m away. Luke Keane, distributor support for HFT, said, “By using a remote sensing head, which can be fitted onto any mechanical or inflatable tube and pipe weld purging system from 25mm (1") diameter upwards, the oxygen level can be measured directly at the weld location and the information will be electronically transferred to the monitor up to 1km away. With this capability, the operator can be certain that the weld purge reading is correct and that the joint will not be adversely affected by oxidation.” The PurgEye 1000 is one of five HFT weld purge monitors to feature

If exhaust gas from a normal weld purge system is piped down a hose to a distant measuring instrument, it may take many minutes, or even hours in some cases, for a stable reading to reach the sensor. The exhaust gas may even be contaminated on the way by outgassing from the walls of the hose material or from air drawn in through a leaky connection. If the oxygen level is too high, the weld would become oxidised at best and might even have nitrogen and hydrogen absorbed into the joint at worst, which could cause metallurgical defects leading to other problems. The PurgEye 1000 weld purge monitor has been designed and developed specifically to prevent oxidation under distance monitoring conditions, and has a sensor placed immediately next to the

The operator can be certain that the weld purge reading is correct and that the joint will not be adversely affected by oxidation, allowing welders to achieve zero-colour welds. The PurgEye 1000 measures oxygen levels from 1,000 parts per million (ppm) down to 1 ppm (accurate to 10 ppm), making it suitable for welding metals such as stainless steels, duplex steels, titanium and zirconium where oxide- free, zero-colour welds are consistently required. Huntingdon Fusion Techniques – UK Fax: +44 1554 836 837 Email: hft@huntingdonfusion.com Website: www.huntingdonfusion.com

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NOVEMBER 2017