What are some common methods for cutting H-beams?

There are several common methods for cutting H-beams:
Flame cutting: Using a mixture of oxy-fuel and acetylene or propane to generate a high-temperature flame, the H-beam is heated to its melting point while simultaneously being cut by blowing and suction.
 
Grinding cutting: Using grinding equipment, such as a cutting machine or angle grinder, the grinding disc is placed on the cutting line of the H-beam, and cutting is achieved by the high-speed rotation of the grinding disc.
 
Hacksaw cutting: Using a specialized hacksaw, such as a circular hacksaw or band saw, the H-beam is sawed along the cutting line.
 
Waterjet cutting: Using high-pressure water jet cutting equipment, such as a waterjet cutter, the H-beam is cut by a high-speed jet of water.
 
Gas cutting: Using oxy-fuel and gas cutting equipment, the H-beam is cut by the gas cutting flame.
 
Each method has its advantages and disadvantages. The specific method chosen should be determined based on a combination of factors, including cutting requirements, equipment conditions, and economic considerations.