TIG and MIG/MAG welding

Aesthetics and effectiveness

Specialists in TIG WELDING in all its applications, titanium, carbon steels, stainless steels, aluminium alloys and nickel alloys

Over the years we have spent a lot of time studying metallurgy and specifically the study of the welded joint.
This knowledge and experience have enabled us to distinguish ourselves in the industry as specialists in TIG welding in all its applications (titanium, carbon steels, stainless steels, aluminium alloys and nickel alloys).

This type of welding, TIG (Tungsten Inert Gas), also known as GTAW (Gas Tungsten Arc Welding), was initially developed for the aircraft industry and is a process that requires a good deal of both theoretical and manual training of the operator, but if done correctly is extremely effective.
With the TIG technique, unlike with other methods, it is possible to precisely control the melt pool in all its characteristics, penetration, width, section and protection.

Over the years, we have performed welds of all kinds, from the simplest aesthetically pleasing to full penetration structural welding.

Alloys

Titanium

Titanium alloys are widely used in various sectors, the most relevant of which are:

aeronautics
aerospace
biomedical
naval
motorsport

The main characteristic common to all titanium alloys is the excellent relationship between mechanical strength and density. Also common to all alloys is high corrosion resistance (due to contact with chemicals or prolonged exposure to weathering), excellent weldability and good machinability.

Going into more detail, the chemical-physical properties of the various main alloys, defined according to ASTM nomenclature, should be considered in order to understand the specific characteristics and consequent use in the various product sectors.

There is a second classification to indicate the degree of purity of each alloy.

Grade 1Commercially defined as pure. Excellent ductility at the expense of low tensile strength. Very good corrosion resistance.

Grade 2also defined as commercially pure, but has a higher percentage of oxygen. It is a very popular alloy due to its good ductility, good mechanical strength and excellent corrosion resistance. It is found in all forms, tube, round, sheet.

Grade 5 (Ti6Al4V): Used mainly in the aerospace, motorsport and marine sectors. High tensile strength, high corrosion resistance but is less ductile than the 2 previous alloys. It is mainly used for machining from solid and for the manufacture of mechanical and structural components.

Grade 9 (Ti3Al2.5V): It has very similar characteristics to Grade 5 but is mainly used for the production of pipes. It is therefore widely used in the motorsport sector. Unlike the grade 2 alloy, which is also available in tubular form, it has better mechanical properties at the expense, however, of a lower elongation percentage. The application sectors and construction technologies between one alloy and the other are therefore different.

Aluminium

It is quite common to make the mistake of generalising under the term aluminium what are in fact alloys composed of various elements; most commonly classified by a numerical code, they range from alloys 1000 (Al 99%) up to alloys 9000, and according to their chemical composition they have certain physical characteristics.

Common among the main characteristics are low density, high thermal and electrical conductivity, high ductility and a low melting point.

The most commonly used alloys are alloys 6000 (Al Si Mg), also called anticorodal.

Alloys 2000 (Al Cu): they require solution heat treatment, hardening and ageing to develop the mechanical values for use; after this treatment they develop mechanical properties comparable to those of carbon steels. They are used for parts and structures requiring high strength-to-weight ratios. They have excellent machinability but limited fusion weldability.

Alloys 5000 (Al Mg): These are alloys of great commercial interest, they increase their mechanical properties by work hardening, i.e. by cold deformation. They are widely used in the production of tanks.

Alloys 6000 (Al Si Mg): excellent weldability and ductility. Although they can be heat-treated for hardening, they do not reach the mechanical properties of alloys 2000 (Al Cu) and 7000 (Al Zn Mg).

Alloys 7000 (Al Zn Mg): Excellent mechanical strength at the expense of lower ductility. They are commonly used where high mechanical strength and fatigue resistance is required. They have good machinability on machine tools and, in most cases, poor fusion weldability. Widely used in the aeronautical, automotive and motorsport sectors, more generally they are used for the construction of parts subject to stress.

Nickel

Nickel alloys are widely used in the motorsport, automotive, shipbuilding and petrochemical industries; mainly due to their excellent resistance to oxidation at high temperatures and corrosion.

They are mainly used for exhaust systems, gas turbines and pipelines for transporting corrosive fluids.

Nickel alloys do not belong to the family of light alloys as they all have a high specific weight and have in common that they are difficult to machine.

The most commonly used alloys are:

Inconel 600:
It has good tensile strength and oxidation resistance at high temperatures, up to 1093°C. It is not suitable for use in the presence of sulphur.

Inconel 625:
Compared to the previous alloy, it has a lower nickel content but the alloy composition increases corrosion resistance. It has excellent weldability and good cold workability. This is why it is often used in the automotive industry for exhaust systems, gas turbines and in the petrochemical industry.

Inconel 718:
It has excellent tensile strength and good corrosion resistance. Like alloy 625, it has good weldability and good cold workability.

Productivity

It changes the speed of execution but not the quality of the service provided.

The MIG/MAG technique is suitable for applications in a variety of sectors, from automotive to earth-moving, equipment construction, structure and frame building and more; wherever productivity and efficiency are key requirements, MIG/MAG welding is a winning technique.

With this welding process, which is mainly applicable on ferrous alloys, aluminium alloys and stainless steels up to high thicknesses, we want to offer our quality and services for medium/light precision carpentry applications, from prototype to series production.

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