tank welding machine

What is a tank welding machine

What is a tank welding machine

Tank welding machine is a machine used to weld the steel plates of large storage tanks.Large storage tank is a kind of tank used to store oil, natural gas and other energy.
The tanks were too big to form at once, so they were welded together with steel plates.
Manual welding is the simplest and most direct method, but because of its high cost and low welding speed. So in the splicing process automatic welding machine equipment has been widely used.
At present, automatic welding technology is widely used in the welding process of large floating roof storage tanks in China, including vertical carbon dioxide shielded welding for vertical seam of tank wall, submerged arc transverse welding machine for circular seam of tank wall, submerged arc automatic flat welding for lap fillet welding and large fillet weld of tank bottom.Transverse seam submerged arc welding is a special form of ordinary automatic submerged arc welding. It is used to weld transverse horizontal straight welds and transverse horizontal girth welds. It uses small welding power supply, arc voltage and high welding speed to obtain the weld forming in the transverse direction.This machine adopts flat characteristic welding power supply, equal speed wire feeding mode, reverse connection.The welding principle is the same as the common submerged arc welding, the main difference is to solve the problem of molten metal and flux drip automatic welding machine layout.
The welding machine equipment is composed of three parts: electric control system, hydraulic system and horizontal sensing system.The electrical control system consists of a general electric control console, a local control console and an electric control cabinet.The level sensing system, each equipped with a level monitor chopper, automatically and uniformly monitors and controls the overall level precision tank rise during jacking.The hydraulic system consists of several small pump stations and a hoist, etc. (a small pump station with a hoist).Local small electric cabinet systems with electrical controls are installed in small pump stations and can be operated independently or with local manual operation on the hopper (usually adjusted separately during sewing).It can realize the overall synchronous lifting, small volume adjustment of single jack bucket, automatic jack gravity.Cooperate with automatic welder to complete the automatic welding and installation of large storage tanks.

Different types of tank welding machine


Automatic Girth Welder 

(top to bottom and bottom to top construction way)


  • Min Tank Diameter : 4.5M
    Plate Width : 1.4-3.2M
    Plate Thickness : 8-45MM
    Construction Method : Top to Bottom& Bottom to Top
    Welding Speed : 300-500mm/Min
    Moving Speed : 2650mm/Min
  • Product Model Application
    Single sided girth welder MSHW-I/Z Storage tanks
    Double sided girth welder MSHW-II
    Jack-up Girth welder MSHW-I/D Jack Up tanks
    Light girth welder/ MSHW-L Tower
    Girth welder for LNG/LPG MSHW-LNG LNG&LPG Tanks
  • The MSHW series comes standard with a Dual Drive System.This self-propelled submerged arc welding system can reduce field storage tank welding time up to 40%.Weld defects are greatly reduced,saving tank erection costs.The Girth Welder is applicable for top down or bottom up construction single or double wall storage tanks for inside and outside welding.


Electrogas welder (EGW) for vertical seam welding 

(one side welding,two side forming)


  • Min Tank Diameter : 6M
    Plate Width : 1.6-3.2M
    Plate Thickness : 8-80MM
    Welding Speed : 0-250mm/Min
    Moving Speed : 550mm/Min
  • Product Model Application
    Electrogas welder MEGW-I/Z Storage tanks
    Multi-pass Vertical welder MMAG-I LNG&LPG Tanks And stainless steel tanks
    Jack-up Electrogas welder MEGW-I/D Jack Up tanks
    Self-shield electrogas welder MEGW-S Used with self-shielded wire
  • 1.Welding forced water cooling, one - time molding 
    2.The liquid level of molten pool is controlled automatically, and the length of welding wire is adjusted automatically 
    3.Aluminum alloy track, magnet adsorption, easy to disassemble 
    4.Small size, light weight, module structure, flexible and convenient to use

Automatic Submerged Arc Welding Tractor

  • Welding Process : SAW
    Model : MLTW-P/J
    Plate Thickness : 6mm and above
    Plate Material : Carbon steel, Stainless Steel
    Groove : Square groove, Single V groove, Double V groove, Lap joint
    Dimension(L x W x H) : 800mm x 500mm x 700mm
    Gross Weight : 90kg
  • The tractor are mobile units can be easily transported to any workstation and adapted to fillet seam and flat seam. The modular design of the tractor make it easier to extend the units with additional devices, i.e. flux supply unit and flux recovery unit. Suitable components can be combined in an optimum way for every welding process.

The tank welding machine tutorial

First. preparation before welding

1. Adjust the operating vehicleAccording to the width of the steel plate, adjust the height of the operating vehicle, so that the distance between the bottom edge of the wheel and the upper surface of the tray can reach the width of the steel plate. At this time, the upper limit of the tray is adjus

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Second. the welding

1, adjust the operation car to the welding position, if it is reverse driving to the welding position, to cross the welding arc point, and then drive in the welding direction, in order to eliminate the mechanical gap, to avoid the appearance of welding tumor, arc point in the back of the arc pit, in

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Third. Stop welding

1. Close the flux valve and stop the flux transmission. 2, press the "stop" button of welding, and then press the "back wire" button, so that the welding wire back to draw a distance. 3, check whether the welding wire is stuck to the weld, in order to avoid driving damage to welding gun and other pa

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Four. No load operation

Select the driving switch, set the "no load" direction, at this time, can operate the left and right control of the car, wire feed, wire back control.

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  • Welding deformation

    Oil storage tank wall design is relatively thin, with the progress of modern welding technology, a lot of welding method can realize the welding of this container, but in the actual operation process, the welding process has been welding deformation problems, this problem has become the development of welding technology in the future must break through the problem.In the welding process of the storage tank, especially in the welding process of the tank floor, the welding deformation is most likely to occur, because the tank floor is relatively thin, and the welding seam is more, it is very easy to appear wave deformation area.

Reason: Causes of welding deformation

  • Longitudinal shrinkage occurs after welding

    This is very similar to the second case, where the joint contracts laterally after welding, whereas in this case the joint contracts longitudinally. The stress from this contraction also causes deformation, resulting in the welding deformation of the tank bottom.
  • Lateral shrinkage occurs after welding

    There are many welds at the bottom of the tank. In the process of welding, the joint is easy to bite the lateral contraction after welding. Once this situation occurs, it will directly produce stress on the tank wall of the tank, thus causing the phenomenon of welding deformation.
  • Radial shrinkage occurs in the welding process

    In the welding process of storage tank, once the force or the generated stress is unbalanced, it is easy to cause welding deformation. In one case, the radial contraction occurs in the welding, which will lead to a certain change in the stress of the mid-width plate, or this contraction will lead to the deformation of the plate Angle at the bottom of the tank.Both of these consequences will cause the appearance of welding deformation.
  • Circumulus welding problem of oil storage tank panel

    In the welding process of the wall of oil storage tank, when the circum-seam welding is carried out, several welders are usually evenly distributed around the wall of the tank, and the welding is conducted in the same direction.In this process, current and voltage beads can easily become high and low convex, and the surface shape of vertical and high beads can also become wavy under low and high beads.Based on this, the following problems often appear in the circular seam welding of oil storage tank panels: poor shape of the first pass bead, pits in the first pass bead, poor shape of the middle pass bead, slag inclusion in the last pass bead, welding penetration at the T-shaped joint, and welding leakage at the groove.

Solution:Preventive measures for welding problems of oil storage tanks

  • Preventive measures for welding deformation of oil storage tanks

    The main cause of floor deformation is the longitudinal shrinkage of the weld seam. The longitudinal shrinkage of the weld seam will lead to the floor warping and deformation, and then make the floor locally convex or wavy.Channel steel and clamp can be used to prevent the local contraction and deformation of the bottom plate.The welding sequence of the plate is from the inside to the outside, from the middle to the periphery. The short weld is welded first, and the long weld is welded later. The long weld of the plate is welded symmetrically by subsection back welding.In the big Angle seam welding, if the weld bead is contracted laterally, it will lead to the problem of Angle deformation of the big Angle seam.In the face of such problems, we should make up, cock ring to the edge of the plate between the channel steel welding squarely in the edge plate, lining, and large fillet welding welding inside the ring first Angle and lateral Angle of annular welding seam, uniform distribution by 2 n welders, welding along the same direction, refund welding welding by subsection welding, effectively prevent deformation.
  • Preventive measures for longitudinal seam welding of oil storage tank panels

    In order to prevent the problem of poor welding penetration, the welding depth can be slightly increased, preferably beyond the groove center, and the groove shape is adjusted, and the welding voltage is slightly increased.In order to prevent the problem of bad fusion, the welding depth can be slightly reduced, the arc voltage has not been increased, and the welding pool and weld bead appearance can be observed and adjusted during the welding process.In order to prevent the problem of insufficient penetration, attention should be paid to make the bottom of the molten pool reach the groove center, and slightly increase the voltage, and adjust the welding edge gap.To prevent edging problems, the voltage should be appropriately lowered, and if the molten pool is offset, it should be moved to the center.Grinding wheel is used to clean the groove and its surrounding rust in order to prevent the occurrence of porosity in the root weld pass.
  • Preventive measures for circular welding of oil storage tank panels

    In order to prevent the bad shape of the first pass bead, in the circular seam welding process of the tank panel, the welding current, welding voltage and welding speed should be carefully set in advance for the correct welding spot position, and the knob should be used to determine. At the beginning of the tank panel welding, the bead should be checked and adjusted quickly.In order to prevent the problem of pitting in the weld pass, all impurities in the groove should be removed during the circular welding of the tank wall. If the pitting occurs continuously, the welding operation should be stopped and the weld pass should be carefully cleaned.In order to prevent the bad shape of the middle-level weld bead, the welding joint position should be strictly corrected, the current should be appropriately reduced and the welding speed should be accelerated in the circular welding process of tank wall.In order to prevent slag inclusion in the final bead, the final bead shall be welded in strict accordance with the specified standards and requirements.In order to prevent the problem of welding through the T-joint, the T-joint should be strictly sealed on the inside of the steel plate, and the penetration depth should be slightly reduced during welding.In order to prevent the problem of leakage welding at the groove, we should ensure that the location of the selected solder joint is scientific and reasonable. If the width of the local groove is too large, manual welding can be applied.

Application of the tank welding machine

1.Large vertical steel storage tank is an important oil and product storage and transportation equipment in petrochemical industry. Welding is the main process of tank construction, which is of decisive significance to the construction quality and progress.


2.In petrochemical enterprises for product containers, generally is a large atmospheric vault storage tank, the current development trend, this kind of tank is bigger and bigger, in manufacturing this kind of large storage tank construction difficulty is becoming more and more big, mainly for welding work harder, welding workload increase, about 50% of the total quantity, therefore, many large sized manufacturing enterprises have taken a variety of technologies. To improve welding efficiency and ensure welding quality, tank welding machine is one of the most effective technical measures.


3. In order to save time and reduce labor costs, tank welding machine have become the best choice for many tank contractors.

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