Welding Boom Arm

Be sure to obtain the proper weld procedures from the manufacturer or someone with experience in welding.
If you're not confident in doing the work yourself, hire a certified welder. This could save you time and money in the long run.
Be sure the electrodes are clean, and in good condition. For steels having yield strengths in excess of 100 ksi (690 MPa), the electrodes must be baked in an oven at temperatures between 700 – 800 F (370 – 425 C) for at least one hour before being used. After baking, the electrodes should be kept in a storage oven at 250 F (120 C) until needed.
Weld with small electrodes using stringer beads instead of using a weaving technique. This limits the heat input into the metal which allows the steel to achieve its full strength. A weaving technique could cause reduced strength as well as re-cracking.
Prepare the area for welding by cleaning any paint, oil, rust or other debris.
Remove the crack and check it with magnetic particle or liquid penetrant testing as you won't be able to see the extended crack beneath the surface.
Be aware of the pre-heat and post heat requirements. The material should be evenly heated to the pre-heat temperature through its thickness for three inches (75 mm) to either side of the repair. Preheating to an excessively high temperature can temper the steel reducing its strength. The temperature should be monitored using temperature indicating crayons on the back side of the joint.
Do not weld in a drafty location, especially when the temperature outside is cold. Drafts quench the weld metal too quickly, resulting in re-cracking either immediately after welding or a few days later.
Wait at least a couple days before examining the final weld using magnetic particle inspection. This is because hydrogen cracking occurs once the weld has cooled.

Boom welding materials
1. Steel plate: The main material of the boom is steel plate. Choosing high-quality and suitable steel plate materials is the key to welding. Common boom steels include Q235, Q345, 16Mn, etc.
2. Welding wire: When welding the boom, commonly used welding wires include low-hydrogen steel welding wire, stainless steel welding wire, etc. Among them, low-hydrogen steel welding wire can improve the strength and toughness of the weld, and is suitable for larger booms and heavy-load conditions. Stainless steel welding wire is suitable for small parts of the boom and corrosive environments.
3. Electrode: When welding the boom, commonly used electrodes include carbon steel electrodes, low-hydrogen steel electrodes, etc. Choosing a suitable electrode can improve the quality and performance of the weld.

Precautions for boom welding
1. Before welding, the material preparation must be done well, the welding part must be cleaned, and there must be no oil stains, rust, and impurities.
2. Boom welding should be carried out in accordance with the specifications, including the selection of welding process, the setting of welding parameters, etc., and comply with relevant safety regulations and operating procedures.
3. During welding, the weld and the parent material should be fully preheated, and the welding speed and current should be controlled to ensure the welding quality and performance.
4. After welding, tests and inspections should be carried out to check whether the quality and performance of the weld meet the requirements to ensure the safe use of the boom.

How to choose suitable welding materials
1. Select the corresponding welding materials according to the material and working conditions of the boom to minimize thermal deformation and stress concentration.
2. Select different welding materials according to the requirements of different parts, such as high-strength materials for connection parts, stainless steel welding wires with good corrosion resistance for small parts, etc.
3. Select welding materials with reliable quality and excellent production technology to avoid using inferior materials and unqualified products.

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