CRACK REPAIR BY METAL STITCHING INSTEAD OF WELDING | 45 YEARS OF EXPERIENCE

Metal stitching is a technology that is over 200 years old and now very well proven and established to undertake crack repair or damage to cast components manufactured out of cast iron or aluminium alloy. In some cases, crack repair is also possible in components made of bronze.

RA Power Solutions as a repair company has tried the process of cast iron block repair by metal stitching, metal locking and welding. We have observed that the repair of damage casting and repair cracks by metal stitching, metal lock and metal surgery is most successful in comparison to welding.

The following are the advantages of the welding process of repair:

• The metal stitching and metal locking are a cold repair of the crack. There is no stress developed as no heat is generated.
• In most cases, no dismantling of equipment is required.
• In normal situations, access to the pneumatic tools is only required.
• Metal lock/metal stitching is a cold method. No loss of alignment or profile is observed. Hence, in most cases, no machining is required.
• The repaired area by the metal lock and the metal stitching process is liquid and gas-tight.
• With time, it has proved to be almost a permanent repair.

The brief process of metal stitching/metal locking for crack repair in aluminium, bronze, and cast iron components is as follows:

To make the crack repair or repair of damaged casting successful by metal stitching and metal lock process, the damaged area must be thoroughly checked for the length, location, and number of cracks, preferably by MPI equipment.

We suggest that a minimum of level two or level three qualified technicians should undertake the crack detection inspection by the MPI process. In case of non-availability of MPI equipment, the crack detection test by dye penetrant test can also be undertaken. It is of utmost importance that no crack should go unidentified, which, in case left without metal stitching and a metal lock. It can elaborate further and cause serious damage to the component and the equipment in totality.

The cracks and the damaged portion should be identified and marked clearly.

The cracked metal is replaced with special metal stitching pins, which are placed by drilling and tapping.

To pull the sides of the crack together, specially designed metal stitching pins are inserted. This results in the continuous formation of a row of interlocking stitching pins. In turn, this develops a strong and pressure-tight repair. The master locks are installed across the joint line bya drilling process to give additional strength.

For all your requirements of Crack Repair by metal stitching, aluminium, or steel casting, you may contact rajshahani@rapowersolutions.com, info@rapowersolutions.com, or call us at +91-9582647131 or +91 9810012383.