Welded H-shaped steel (YB 3301-81) (3)

Abstract

The third part of the article on welding H steel (YB 3301-81) provides an introduction to the welders setup, describes the welding parameters, and discusses ways to avoid common welding errors. The article also outlines various methods of achieving good welds on H steel as well as techniques for dealing with special situations. To do so, the article examines the use of flux-cored and stick welding, as well as welding with different wires. All methods discussed in this article must follow the standards and procedures mentioned in previous parts of the article to ensure consistent and reliable welds on H steel.

Introduction

Welding H steel (YB 3301-81) requires carefully setting up the welder and carefully controlling the welding parameters. However, due to the high tensile strength of such steel, it is also critical to understand how to minimize welding errors and adjust the welding parameters as needed to ensure good welds.

Achieving Good Welds

Prior to welding, it is essential to prepare the surfaces of the H steel to be joined. This includes cleaning, deburring, and grinding, which increase the life and strength of the weld. It is also important to adjust the welder settings to suit the material and the welding position (horizontal, vertical, or overhead).

Flux-Cored Welding

Flux-cored welding is a popular method of welding H steel thanks to its wide range of welding wires and settings that offer greater efficiency and improved welds. A range of welding wires of various diameters and different flux-cored fillers is available, allowing welders to make accurate and consistent welds on H steel. Such wires are also often used together with gas shielding for superior protection against oxidation and other gas-related problems.

Stick Welding

Stick welding is another commonly used technique for welding H steel. Its strength and low penetration make it suitable for welding thicker plate without too much distortion or slag inclusions. This welding method is best used in lower amperage settings to ensure a consistent and reliable weld.

Welding with Different Wires

The number of wires and the type of wire you use also affects the welds on H steel. For example, using a single low-tension wire results in better welds than using multiple higher-tension wires. Welders must also pay attention to the position and the shielding gas used, as this affects the weld profile and strength.

How to Avoid Common Welding Errors

In addition to the welding techniques already discussed, there are some common mistakes to be aware of while welding H steel. It is important to pay attention to the following:

1. Properly clean and prepare the material before welding.

2. Use a shielding gas that matches the welding wire and electrode.

3. Make sure to use the correct current and voltage.

4. Ensure that the wire has a tight connection with the joint.

5. Do not let the welding current fluctuate.

6. Perform regular maintenance on the welding machine.

7. Wear the proper safety gear and make sure the welds are not too close to flammable material.

Conclusion

The welding of H steel can be challenging, but with careful preparation and attention to detail, welders can achieve reliable and strong welds. This article has outlined the use of different welding techniques and methods for welding H steel, as well as tips for avoiding common welding errors. All welding techniques and methods discussed must follow the standards and procedures outlined in the previous parts of this article to ensure consistent and reliable welds on H steel.

Welding of H-beam Steel (YB 3301-81) (III)

H-beam steel welding is an important process in the processing of steel products. In order to ensure the welding quality of H-beam, so that the product meets the requirements of standard, the following welding steps shall be taken:

(1) Welding preparation: Including removing the oxide scale, rust and paint on the joints, designing and cutting the welding line and welding angle, as well as grinding and polishing the welding surface.

(2) Welding: The type of welding shall be submerged arc welding. The kind and diameter of electrode shall be determined according to the requirements of welding quality and welding process. The welding current and voltage shall be relevant to the kind of electrode and welding position. The welding speed shall be moderate.

(3) Cleaning of welding seams: While welding, there would be formed some impurities on the seams, including iron rust, iron slag, welding slag and other dirt. Therefore, they would be cleared up until the welding surface is clean to ensure excellent welding performance.

(4) Nondestructive inspection of welding seams: Adopt X-ray or ultrasonic test to inspect welding quality of the welding line. Relevant documents such as welding specification sheet and welding certificate should be filled up and signed when the inspection result is qualified.

(5) Post-welding heat treatment: The annealing process would be carried out if the welding line has large stress, distortion or cold cracking behavior after welding. Meanwhile, the post-welding heat treatment should be carried out to ensure the strength and toughness of joint seams.

Finally, H-beam steel welding is an important process must be taken in the manufacturing of steel products. To control quality well, it is necessary to strictly follow the above procedures and also continuously improve welding management.