Strength of weld metal

It is best to do a mechanical property test. If you really don’t want to do it but want to know, then refer to the warranty of the welding material and base material. The warranty has detailed mechanical performance indicators. Taking the neutralization factor into consideration, the middle value is estimated to be similar to the value obtained from the experiment!

In the manufacturing of pressure vessel equipment, the principle of selecting welding materials is to use low rather than high. Select the material with lower strength among the base metals. Just select the allowable stress

The strength of the welding metal depends on the parameters of the welding rod. Generally speaking, the strength of the welding rod should be higher than the material being welded. I don’t know if I am right. Could you please explain it?

The welding strength of metal can be tested using a testing machine. Test items generally include: Tensile stress, tensile strength, tear strength, tear elongation, constant elongation stress, constant stress elongation, constant stress force value, tear strength at any point, force value at any point, elongation at any point, pull-out force, adhesive force and calculated peak value, pressure test, shear peel force test, bend test, pull-out force, puncture force test. This post was last edited by 263525689 on 2009-4-21 22:47 ]

According to the equal strength point of view, the strength of the weld should be equal to the strength of the shell, but there are some gaps in practice. This requires the designer to put forward specific requirements for the strength of the weld according to the importance of the specific equipment. For example, requiring mechanical tests on the weld to obtain data for comparison with the data of the shell. In addition, the strength index requirements for the weld of the hydrogenation reactor are the same as those of the shell. Others should be handled as appropriate according to the equipment. Of course, the designer is required to have certain practical work experience for reference. :)

The strength of the weld metal should be obtained by taking samples during the welding process qualification and conducting mechanical tests according to the methods specified in the standard. The qualification index is that it is not lower than the standard strength value of the base metal on the lower strength side (according to the material standard of the base metal). The selection of welding materials should meet the standards for welding procedure qualification, GB pressure vessels are in accordance with JB 4708, and ASME products are in accordance with ASME Volume IX.

I often do experiments. The tensile thickness bends the base metal and the weld to see whether it breaks at the base metal or the weld, and then determines the tensile strength.

The ideal strength of the weld is the strength on the welding rod.

The strength of the weld metal needs to be actually tested. After the welding wire or electrode is purchased, a test welding is carried out on the surface of the material, a certain thickness is cladded, and then the base metal is processed away, leaving the pure weld metal, and then a performance test is performed, usually by stretching. This result ensures that the performance must be that of the weld metal. Usually the welding wire and the base metal are weakly matched, that is to say, the tensile strength of the welding wire is lower than the base metal, and the elongation is relatively high, but it is not necessarily the case when it becomes the weld metal. After deposition, the welding seam has coarse grains, some elements are burned during the welding process, some elements are segregated, and the oxygen content in the welding seam may be many times higher than that in the welding wire. Various factors during the welding process cause the strength of the welding metal and the strength of the welding wire to be different. The strength of welding wire is usually low and the elongation rate is high (otherwise, how can we make wire, haha)