Category: crack repair in cast iron

Crack Repair Using Metal Stitching and Metal Locking | RA Power Solutions

Cracks in cast iron and other metal components can lead to significant operational challenges in the power generation, marine, manufacturing, and heavy engineering industries. Traditional repair methods, like welding, often introduce thermal stress, weakening the material over time. With over 44 years of experience, RA Power Solutions specializes in metal stitching and metal locking, two highly effective cold repair techniques that restore the integrity of cracked components without causing additional damage.

What is Metal Stitching?

Metal stitching is a cold repair method for mending cracks in cast iron, aluminum, and other metals without welding. It involves drilling precise holes along the crack, inserting metal stitching pins, and locking the pieces together to restore the component’s original strength. This technique is ideal for engine blocks, turbine casings, compressors, and other high-stress industrial machinery parts.

Metal stitching and Metal locking
Metal stitching and Metal locking

What is Metal Locking?

Metal locking is a reinforcement method used alongside metal stitching. Custom-designed locks are inserted into the stitched area to provide additional support, preventing further crack progression and ensuring a long-lasting repair. This method enhances the durability of the repaired component, making it as strong as or even stronger than the original structure.

metal locking
Metal locking

Why Choose Metal Stitching and Metal Locking?

Compared to traditional welding, metal stitching and locking offer several advantages:

  1. Cold Repair Process: No heat is applied, preventing material distortion, stress buildup, and further cracking.
  2. Onsite Repairs: No need to transport heavy machinery; repairs can be performed at the client’s location, reducing downtime.
  3. Retains Original Strength: Unlike welding, which can weaken cast iron, metal stitching and metal locking maintain or even improve the structural integrity.
  4. Cost-Effective: Eliminates the need for expensive replacements and reduces overall maintenance costs.

Benefits of Metal Stitching and Metal Locking

RA Power Solutions has successfully performed repairs for various industries, including:

  • Marine Industry: Repairs on ship engine blocks and connecting rods to avoid costly replacements.
  • Power Plants: Restoration of turbine casings, generators, and compressors to maintain efficiency.
  • Manufacturing Plants: Fixing cracks in heavy-duty machines and industrial equipment.

RA Power Solutions provides metal stitching and metal locking services in countries across Asia, the Middle East, Europe, Africa, and the Americas, including India, UAE, USA, UK, Saudi Arabia, Germany, Singapore, and Australia. With a strong global presence, the company offers onsite repair solutions for industries like marine, power plants, and heavy engineering, helping clients avoid costly replacements and downtime. Their expertise extends to Malaysia, Indonesia, Qatar, Oman, Kuwait, Bangladesh, Sri Lanka, the Philippines, Vietnam, Nigeria, Brazil, Germany, Singapore, Malaysia, Indonesia, and South Africa, ensuring reliable crack repair services worldwide.

Crack repair by metal stitching
Crack repair by metal stitching

For more information regarding repair cast iron, repair crack cast iron, or cast iron repair,  crack repair by metal stitching and metal locking, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com, or call us at +91 9582647131 or +91 9810012383.




Cracks in cast iron and other metal components can lead to significant operational challenges in the power generation, marine, manufacturing, and heavy engineering industries. Traditional repair methods, like welding, often introduce thermal stress, weakening the material over time. With over 44 years of experience, RA Power Solutions specializes in metal stitching and metal locking, two … Continue reading “Crack Repair Using Metal Stitching and Metal Locking | RA Power Solutions”

Cast Iron Crack Repair with Metal Stitching & Metal Locking

Experts highly recommend metal stitching and metal locking for repairing cracks in cast iron. Industries around the world use this cold repair technique because it delivers reliable and effective results when restoring cast iron components.

Broken cast iron pieces can also be replaced by a new piece of casting undertaking metal locking. This technology is as old as the introduction of cast iron casting in industry.

Insertion of Casting Piece in Engine Block
Insertion of Casting Piece in Engine Block
Metal Stitching of Jenbacher Engine Block in Process
Metal Stitching of Jenbacher Engine Block in Process

Metal keys and metal locks are used to undertake crack repair in cast iron casting.

Metal keys and Metal Locks are used in Metal Stitching/Locking Process

RA Power Solutions Pvt. Ltd. has a team of trained technicians who carry out metal stitching of broken or cracked castings directly onsite. They bring all necessary tools, consumables, and, if needed, a replacement casting to the site. The team repairs the crack onsite and avoids any need to disassemble or transport the equipment.

Metal Stitching Done in Broken Area of Generator
Metal Stitching Done in Broken Area of Generator

Tests and experience show that metal stitching repairs can strengthen cracked castings. The repaired section often becomes even more durable after the process. We execute crack repairs on board the vessel, in power plants all over the world.

Why Choose Cold Repair Over Welding?

Traditional welding uses heat to damage alignment, change grain structure, and weaken cast iron components. Cold repair procedures such as metal stitching and locking maintain the original material integrity. This results in stress-free, distortion-free, and high-strength solutions.

What Is Metal Stitching & Metal Locking?

Metal stitching is a cold bolt-locking process that includes drilling precise holes along a crack and inserting metal “keys” and studs into a dovetailed pattern. These studs bite into one another, tightening the crack and restoring structural rigidity.
Metal locking supports stitched joints with custom-shaped metal inserts, inhibiting additional proliferation and boosting long-term endurance.

We extend metal stitching services all over the world, including countries like Madagascar, Oman, Qatar, Philippines, Bahrain, Srilanka, Bangladesh, Myanmar, Turkey, Nigeria, Greece, Saudi Arabia, UK, Dubai, Singapore, Malta, and Cyprus, etc.

For more information on crack repair by metal stitching, Cast Iron Crack Repair, cast iron stitching, repair cast iron, cast iron metal stitching services, crack repair in cast iron, and repairing cast iron metal lock, contact us at rajshahani@rapowersolutions.com or info@rapowersolutions.com or call us at +91 9582647131, or +91 9810012383.

FAQs:

1. What is metal stitching in cast iron repair?

Metal stitching is a cold repair process used to restore cracked or damaged cast iron components. It involves inserting special metal keys and locking pins across the crack to mechanically join and seal it—without using heat or welding.

2. How is metal locking different from metal stitching?

While both methods are used together, metal locking adds reinforcement by embedding strong metal locks or inserts that cross the crack. These locks increase structural integrity and prevent further crack propagation.

3. Why is metal stitching better than welding for cast iron?

Welding applies heat that can distort the casting and cause new cracks due to thermal stress. In contrast, metal stitching is a cold process, meaning there’s no heat, no distortion, and the original metallurgical properties remain intact.

Experts highly recommend metal stitching and metal locking for repairing cracks in cast iron. Industries around the world use this cold repair technique because it delivers reliable and effective results when restoring cast iron components. Broken cast iron pieces can also be replaced by a new piece of casting undertaking metal locking. This technology is … Continue reading “Cast Iron Crack Repair with Metal Stitching & Metal Locking”