Daily question in the tower equipment technology exchange section – participate in the prize-winning activity! (02.04)

Preventive measures against deformation resulting from post-weld heat treatment of tower-type equipment can be taken from the following aspects: The welding process refers to the technical requirements and operational specifications for welding tower equipment, including the welding method used, welding grooves, types and diameters of electrodes, welding process parameters, welding sequence, number of weld layers, pre- and post-weld treatments, requirements for the welding environment, as well as measures to prevent and counteract deformation. 　　The welding process must undergo process qualification to be deemed satisfactory, and the process requirements must be strictly followed during welding operations. 　　Based on the welding conditions and volume of work for tower equipment, the extent and pattern of deformation that will occur during welding are analyzed in advance, allowing for targeted control measures to be established: (1) For tower equipment with multiple weld passes, it is necessary to assemble the components into a single unit first before proceeding with welding; the welding should be carried out symmetrically, and the specified welding sequence must be followed. 　　(2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. 　　(3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. 　　(4) During welding, a reasonable assembly sequence and welding deformation prevention measures should be adopted to ensure no deformation occurs during manufacturing. 　　(5) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment. This post was last edited by 13897295006 on 2009-2-3 22:34]

Preventive measures against deformation resulting from post-weld heat treatment of tower-type equipment can be taken from the following aspects: The welding process refers to the technical requirements and operational specifications for welding tower equipment, including the welding methods used, welding grooves, types and diameters of electrodes, welding process parameters, welding sequence, number of weld layers, pre- and post-weld treatments, requirements for the welding environment, as well as measures to prevent and counteract deformation. 　　Based on the welding conditions and volume of work for tower equipment, the extent and pattern of deformation that will occur during welding are analyzed in advance, and targeted control measures are formulated: (1) For tower equipment with multiple weld passes, it should first be assembled into a single unit before welding, and the welding process should be carried out symmetrically. 　　(2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. 　　(3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. 　　(4) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

Ensure uniform temperature during post-weld heat treatment to reduce thermal stress in pressure vessels during heating. During heating or cooling, the temperature difference across different parts of the heated area shall not exceed 130°C within a range of 4,500 mm. (1) Select the heating power appropriately by taking into account the actual conditions of the internal components, external dimensions, and weight of different parts of the equipment. (2) A fully functional temperature control device is used to regulate, display, and record the set temperature. (3) A temperature measurement section is installed every 1.5 m, with 4 temperature measurement points at the top, bottom, left, and right. When the number of automatically controlled temperature measurement points is insufficient, additional non-automatically controlled temperature measurement points can be added as needed. (4) When the internal components and shape of the equipment are complex. When conventional heating fails to achieve the required temperature uniformity. A hot air circulation system can be added.

　　(1) For tower equipment with multiple weld passes, it should first be assembled into a single unit before welding; the welding must be carried out symmetrically, and the specified welding sequence must be followed. 　　(2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. 　　(3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. 　　(4) During welding, a reasonable assembly sequence and welding deformation prevention measures should be adopted to ensure no deformation occurs during manufacturing. 　　(5) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

I don’t know much about these; I agree with what was said above. Preventive measures against deformation caused by post-weld heat treatment in tower-type equipment can be taken from the following aspects: The welding process refers to the technical requirements and operational specifications for welding tower equipment, including the welding methods used, welding grooves, types and diameters of electrodes, welding process parameters, welding sequence, number of weld layers, pre- and post-weld treatments, requirements for the welding environment, as well as measures to prevent and counteract deformation. 　　Based on the welding conditions and volume of work for tower equipment, the extent and pattern of deformation that will occur during welding are analyzed in advance, and targeted control measures are formulated: (1) For tower equipment with multiple weld passes, it should first be assembled into a single unit before welding, and the welding process should be carried out symmetrically. 　　(2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. 　　(3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. 　　(4) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

Preventive measures against deformation during heat treatment: (1) The heat treatment furnace must meet regulatory requirements; the temperature inside the furnace should be uniform and accurate. A flame shield should be installed at the flame nozzles on the furnace walls to prevent the flame from coming into direct contact with or approaching the parts being heat-treated. 　　(2) When components of larger length are fed into the furnace, temporary supports must be used; the number of such supports depends on the specific dimensions of the container. 　　(3) Shells with a larger diameter and thinner thickness generally require internal reinforcement. 　　(4) For segmented prefabrication, reinforced supports should be provided at the segment joints. 　　(5) Tower equipment components that are prone to losing stability at high temperatures should also be reinforced according to specific circumstances.

The answer from the second floor is very comprehensive; I completely agree with the views expressed there.

Measures to be taken: For tower equipment with multiple weld passes, the components should first be assembled into a single unit before welding, and the welding should be carried out symmetrically. For such equipment, such as segmental composite heads and shell transition sections made up of segments, in addition to meeting the above requirements, jig fixtures should also be used at the welding site. When welding longer tower sections, the dimensions of the tube sections should be adjusted to account for the welding contraction, thereby preventing shortening of the shell after welding. Counter-deformation measures: Based on practical experience or calculations, deformation can be applied to the welded parts in a direction opposite to that of the welding deformation; this pre-deformation will then be offset after welding, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

The content is really comprehensive; I only knew about symmetrical welding and welding allowances – I’ve learned so much! Preventive measures against deformation caused by post-weld heat treatment in tower-type equipment can be taken from the following aspects: The welding process refers to the technical requirements and operational specifications for welding tower equipment, including the welding methods used, welding grooves, types and diameters of electrodes, welding process parameters, welding sequence, number of weld layers, pre- and post-weld treatments, requirements for the welding environment, as well as measures to prevent and counteract deformation. 　　Based on the welding conditions and volume of work for tower equipment, the extent and pattern of deformation that will occur during welding are analyzed in advance, and targeted control measures are formulated: (1) For tower equipment with multiple weld passes, it should first be assembled into a single unit before welding, and the welding process should be carried out symmetrically. 　　(2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. 　　(3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. 　　(4) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

I completely agree with the person above! ～Preventive measures against deformation resulting from post-weld heat treatment of tower-type equipment can be taken from the following aspects: The welding process refers to the technical requirements and operational specifications for welding tower equipment, including the welding method used, welding grooves, types and diameters of electrodes, welding process parameters, welding sequence, number of weld layers, pre- and post-weld treatments, requirements for the welding environment, as well as measures to prevent and counteract deformation. 　　The welding process must undergo process qualification to be deemed satisfactory, and the process requirements must be strictly followed during welding operations. 　　Based on the welding conditions and volume of work for tower equipment, the extent and pattern of deformation that will occur during welding are analyzed in advance, allowing for targeted control measures to be established: (1) For tower equipment with multiple weld passes, it is necessary to assemble the components into a single unit first before proceeding with welding; the welding should be carried out symmetrically, and the specified welding sequence must be followed. 　　(2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. 　　(3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. 　　(4) During welding, a reasonable assembly sequence and welding deformation prevention measures should be adopted to ensure no deformation occurs during manufacturing. 　　(5) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

　　(1) The heat treatment furnace must meet the specified requirements; the temperature inside the furnace should be uniform and accurate. A flame shield should be installed at the flame nozzles on the furnace walls, to prevent the flame from coming into direct contact with or approaching the parts being heat-treated. 　　(2) When components of larger length are fed into the furnace, temporary supports must be used; the number of such supports depends on the specific dimensions of the container. 　　(3) Shells with a larger diameter and thinner thickness generally require internal reinforcement. 　　(4) For segmented prefabrication, reinforced supports should be provided at the segment joints. 　　(5) Tower equipment components that are prone to losing stability at high temperatures should also be reinforced according to specific circumstances.

To prevent deformation of tower-type equipment due to post-weld heat treatment, the following measures can be taken: (1) For tower equipment with multiple weld passes, it should first be assembled into a single unit before welding; the welding should be carried out symmetrically, and the specified welding sequence must be followed. 　　(2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. 　　(3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. 　　(4) During welding, a reasonable assembly sequence and welding deformation prevention measures should be adopted to ensure no deformation occurs during manufacturing. 　　(5) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

Preventive measures against deformation caused by post-weld heat treatment in tower-type equipment can be taken from the following aspects: The welding process refers to the technical requirements and operational specifications for welding tower equipment, including the welding method used, welding grooves, types and diameters of electrodes, welding process parameters, welding sequence, number of weld layers, pre- and post-weld treatments, requirements for the welding environment, as well as measures to prevent and counteract deformation. The welding process must undergo process qualification to be deemed satisfactory, and the process requirements must be strictly followed during welding operations. Based on the welding conditions and volume of work for tower equipment, the extent and pattern of deformation that will occur during welding are analyzed in advance, allowing for targeted control measures to be implemented: (1) For tower equipment with multiple weld passes, it should first be assembled into a single unit before welding; the welding process must be carried out symmetrically, and the specified welding sequence must be followed. (2) For tower equipment with multiple weld passes, such as melon-segment type combined heads and shell transition sections composed of segments, in addition to meeting the above requirements, mouth-shaped fixing fixtures shall also be installed at the welding site. (3) When welding longer tower sections together, the dimensions of the cylinder segments should be adjusted to account for the welding contraction, in order to prevent the shell from shortening after welding. (4) During welding, a reasonable assembly sequence and welding deformation prevention measures should be adopted to ensure no deformation occurs during manufacturing. (5) Counter-deformation measures: Based on practical experience or calculations, a deformation is applied in advance to the welded part in the direction opposite to that of the welding deformation; after welding, this pre-deformation amount precisely cancels out, and this approach can effectively prevent deformation resulting from post-weld heat treatment.

When the tower is placed horizontally, add reinforcing rings in front of and behind the welding area and then weld symmetrically! When erecting, it should be welded symmetrically while in a lifted state! ! The welding result is better this way! !