Welding

Welding is a joining technique whereby metal materials are heated up and joined together through a process of fusion.

The most common techniques are gas metal arc welding (MIG/MAG) and gas tungsten arc welding (TIG).

MIG/MAG

The MIG/MAG welding method is being deployed more and more widely. This is primarily because it allows high productivity and is relatively easy to automate.

Under this method, a consumable metallic wire is continually fed and melted through the formation of an electric arc. The metal wire functions both as an electrode and a filler metal.

The fundamentals of effective welding include tension, wire feed speed and the right flow of shielding gas.

TIG

TIG welding utilises a non-combustible tungsten electrode to produce the weld. If a filler metal is used, this is added to the front section of the fusion zone.

TIG welding provides a clean, high quality welding seam, primarily because no slag is generated.

Robotic welding

Robotic welding is normally performed with the MIG/MAG methods, using the most common types of materials, such as steel, stainless steel and aluminium.

Depending on the design of the component, it may even be rational to robot-weld lower volumes. Robotic welding may also be suitable for components in low volume serial production requiring multiple stages of welding over a long period.

Robotic welding makes it possible to achieve cycle times which are commonly one-third of the duration of manual welding cycles, or quicker still.

In recent times, CMT technology has begun to emerge. This requires a special power supply, which means the material is not heated up to the same level required by conventional welding, providing a clean, practically spatter-free welding seam. CMT technology is most effective for material thicknesses up to 3.0 mm.

Bendex has extensive experience of, and capacity for robotic welding. We handle welding projects using both traditional power supply and modern CMT technology.

The health risks associated with welding can be substantial, primarily due to smoke and gas formation. As a result, it is important to operate sound ventilation and a highly developed extractor system. If recycling ventilated air, it is also important to capture metallic dust.