Welding services

METALS WE WELD: iron, aluminium, zinc, copper.
ALLOYS WE WELD: stainless steel, bronze, brass, cast iron.

Costruzione Ricambi Macchine Industriali provides its clients in Milan with a number of specific services, such as welding for special metals and alloys. 

Our welding services are TIG (with or without added material), MIG (or continuous wire), coated electrode and resistance. Through them we carry out repair and assembly of manufactured goods (in the metals and alloys listed) for a range of sectors, including industrial, craft, art, transport, large and small catering, and domestic. 

In addition, we can build any kind of structure or item in metal, on request or to a design.

A few examples of metal products we repair or manufacture: metal parts for cars, lorries, motorcycles and bicycles (frames, light alloy wheels, mechanical heads and components, etc.), aluminium stairs and items, indoor and outdoor structures of various sizes (frames and supports for curtains, cover boxes for gas meters, etc.), chandeliers, art and design objects for furnishing houses, pots and pans and kitchen tools.


WE DON'T WELD ZAMAK.

Get in touch, or come and visit our offices at Via Cortina D’Ampezzo 14 (Ripamonti-Vigentino area) in Milan, for a full, personalised quote.

WHAT IS TIG WELDING?


welding metals

TIG (Tungsten Inert Gas) welding or GTAW (Gas Tungsten Torch Welding), is one of the most common methods in use. It is an arc welding process, using an infusible electrode (tungsten), under the protection of an inert gas, which can be done with or without a filler metal. The procedure is based around a torch in which the tungsten electrode is inserted. The protective gas flows around the electrode, having arrived on the welding bath through a ceramic nozzle. The worker moves the torch along the joint to move the weld pool, by positioning the infusible tungsten electrode at a maximum distance of a few millimetres and keeping this distance constant. The electrode must never come into direct contact with the piece to be welded, otherwise the tungsten rod will become attached to the joint, which interrupts the weld. Where filler material is required, the rod  of material is moved simultaneously, so that the end is kept constantly within the arc and under the protective gas.

Our company's workers are specialists and carry out TIG welding on very thin pieces of stainless steel using linear and circular positioners.

WHAT is MIG WELDING?


What is termed MIG welding (Metal-arc Inert Gas) is a type of arc welding in which the metal is kept under a protective gas, and is among the most widely used welding processes. MIG welding is a continuous wire process, in which protection of the welding bath is ensured by a covering gas, which flows from the torch onto the workpiece. The fact that it is a continuous wire process ensures high productivity, and the presence of gas allows work to be carried out without producing any slag. All this increases the cost of the procedure.

WHAT IS COATED ELECTRODE WELDING?


Coated electrode welding or SMAW (Shielded Metal Arc Welding - arc welding with the metal protected) is currently the most widespread welding method in the world.

The electrode consists of a metal rod, called the core, which is covered with a dried mixture, or coating, composed of several deoxidising materials. During welding, when the electrode is brought within a suitable distance from the piece, the electric arc melts the metal electrode material, the coating and the metal of the part to be welded. The welder manually moves the gripper, thereby managing the welding bath. After the operation, the welder must chisel off the crust (slag) that formed over the solder, which serves to protect the metal whilst cooling.

WHAT IS RESISTANCE WELDING?

Resistance welding (RWis an autogenous pressure welding method in which the material is heated by an electrical resistor. Resistance welding is generally used to weld steels, and implemented in three phases:

1. The electrodes (generally copper, formed into a wheel or point-like shape) are brought near to the surface of the parts to be welded (usually two sheets) then the machinery exerts the pressure needed to compress the parts between them.

2. A predetermined current is passed through the electrodes.

3. The electrodes are removed from the surfaces of the piece, so they are joined by a small volume of melt and solidified (welded or spot welded).

The wheel-shaped electrodes are made to rotate continuously and often feed the workpiece. Resistance welding has the advantage of having less severe thermal cycles, and thus a significantly reduced heat-affected zone than other types of welding. However, it can only be performed on sheets of limited thicknesses (generally up to 3 mm).

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