Does using the wrong welding rod have any impact?
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When manufacturing the steel structure of the convection chamber in our company’s heating furnace, we used JH-426 welding rods at the support points and load-bearing areas as specified in the drawings, while JH-422 welding rods were used for the rest. However, due to carelessness, JH-422 welding rods were used for all the welds. I’m not sure if this will have any impact on the equipment. Last edited by zzg5680 on 2008-12-13 16:38.]
Of course it has an impact! J422 is a calcium-titanium type alkaline welding rod, while J426 is a low-hydrogen potassium type acidic welding rod. The regulations state that for critical components, J426 welding rods should be used in most cases. If J426 has already been used, the impact isn’t significant, but it’s not allowed according to the rules!
If done carefully, it is recommended to conduct an additional welding evaluation to determine whether the properties of the weld joints made using 422 welding rods are suitable for the design conditions
The most critical factor is the gas content in the weld metal, which is related to the welding electrode as well as the skill level of the welder. But just like the limits on a crane’s winch, we must trust the equipment and regulations, not people.
There is definitely an impact. J422 is used for welding ordinary areas; J426 electrodes should be used for important components! The current remedy is to conduct a thorough and careful inspection of the welds that should have been welded using J426 electrodes, and if necessary, carry out welding evaluations to determine whether these welds meet the required standards. If possible, it is best to keep the relevant information and welding qualification records.
Is it effective to weld JH-426 once more on the original weld?
The welded area becomes higher, resulting in increased thermal stress; I feel this is not right – it’s better to operate under monitoring
The day before yesterday, we welded a pressure vessel for cooling (boiler steel 20). Initially, due to limited conditions, an AC welder and 422 welding rod were used. No matter how it’s welded. The welds kept cracking. In the end, I borrowed a DC welder and 506 welding rods from somewhere else; this improved the situation somewhat, but cracking still occurred because 422 welding rods had been used earlier. A small bug took two whole days to fix. I don’t know what the problem is. It seems that choosing the welder and electrodes as well as parameters such as current based on the material is extremely important.
It should be constructed according to the design; using the wrong welding rod will definitely have an impact.
How can such a mistake be made? The technical staff bear great responsibility; the management department must be strict. If I made such a mistake, I would have to leave immediately – no room for repeated errors. Measures must be taken in accordance with the rules to make things right
As required, this is an unforgivable mistake! Using the wrong welding rod can lead to serious problems for the equipment!
Give it a thumbs up; I agree, that’s the way to go
It is related to the welding electrode; different electrodes result in different strength properties after welding.
It is recommended to conduct trial production and evaluation.
The problem should not be serious; both J422 and J426 electrodes have the same strength grade. For safety reasons, it is advisable to conduct a weld evaluation. Additionally, J422 is an acidic welding electrode.
This has a significant impact on such a structure; it is necessary to conduct a welding process evaluation, focusing on impact toughness values and bending tests – the tensile strength is generally not an issue. The toughness of the joint has a major influence on fatigue damage.