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1. Critical Specifications: From customer perspective, the key index for selecting suitable models of machine are the max. width and thickness of sheet metals to be joint;
2. Sometimes, customers may also need to indicate on the minimum width of butt welding plates, which involved design of pressing block. The minimum width of steel plate should not be too small, because there is interval between pressing blocks;
1) These are distinguished based on workpieces sheet metals width. In other words, length of joint butt welding seams to be delivered from:
2) MP20: Delivering the max. 2000mm length of butt welding joint seam/ sheet metal width, the same as other models:
3) Typical models: MP23, MP25, MP30, MP35, MP40, MP45, MP50;
| Models of Steel Plate Flat Butt Welding Machine | MP20/ 23/ 25/ 30/ 35/ 40/ 45/ 50 |
| Max. Length of Butt Joint Welding Seam | 2,000/ 2,300/ 2,500 / 3,000/ 3,500 / 4,000 / 4,500 / 5,000 mm |
| Thickness and Material of Sheet Metal Plates for Butt Welding | Thickness: 6 ~ 40mm for SAW; 2~ 6mm for CO2 welding; 2~ 12mm for plasma welding Material: Low carbon steel, Stainless steel, Al alloy |
| Thickness Straight Edge Butt Welding without Groove | 6 ~ 15 mm |
| Optional Flame Triple Cutting Velocity for Grooving | 100 ~ 800mm/min. Stepless Adjusting, A.C. Inverter control |
| Fully Penetration Welding Melt-thru Velocity | 200 ~ 1000mm/min. Stepless Adjusting, A.C. Inverter control |
| Sheet Metal Feeding Speed | 2500 mm/min. |
| Butt Welding Mode | Submerged Arc Welding / CO2 Gas Shielded/ Plasma fully penetration welding Melt thru |
The above 1st and 2nd Photos:
1. For Steel Plate with Thickness Less Than 15mm:
1) Sheet metal does not need cutting welding groove ahead of time;
2) Just leave a gap of 2-3mm between the 2 pieces of joint plates, and carry out butt welding directly;
2. For 15mm to 28mm Thickness Plates:
1) Straight and slant edge beveling can be implemented simultaneously in the steel Plate Joint Welding Machine;
2) This means, one time flame triple cutting can complete straight and slant grooving together on steel plates;
3. For 28mm to 40mm Thickness Plates:
To acquire eligible welding groove on edges of sheet metal:
1) First implement on straight edge cutting;
2) Recede flame cutting torch, and tilt it 150°;
3) Finally cut slant edge on sheet metal steel plate;
The above 3rd and 4th Photos:
1) The 3rd photo: For successfully implementing on melt-thru butt welding (One side welding, and both sides welding seam formation), double layers of welding flux need to be deposited;
2) Before Melt-thru Butt Welding:
a) The top layer welding flux should be deposited on top surface of sheet metal. This layer of welding flux will be part of generated butt welding seam. So, it has much more consumption than bottom layers of welding flux, around 10 times difference.
b) The bottom layer welding flux should be deposited on top surface of copper pads, right beneath bottom surface of sheet metal. Its main purpose is to isolate joint plates and copper pads, of low consumption;
3) Model of welding flux recommended for Chinese customers are FCB-1R and FCB-1 respectively;
Take 8mm to 20mm thickness range carbon steel plate as example, the critical process control parameters for single side welding and both sides completion include:
1) 680~ 760A welding current;
2) 35~ 37V welding voltage;
3) 420 ~ 585 mm/min. continuously adjustable welding speed;
4) 1 ~ 2.5mm butt welding clearance;
5) 0°~ 20° welding torch angle;
6) 0~ 4mm welding edge blunt side size;
3. The above 4th Photo: Finished test piece joint plate, fabricated from Wuxi JACK MP25 Steel Plate Flat Butt Welding Machine. There are validated process control parameters chalk marked on the sample piece.
Significance: The smooth transportation/ accurate positioning/ reliable clamping of joint plates are preconditions on successful running:
1. Transportation Reliability Assurance: (The above 1st Photo)
1) There are alignment rollers installed along input and output conveyors;
2) At one side of roller tables, there are manual adjust leadscrews, being installed in regular intervals, serving as reference on long plates alignment;
3) At opposing side of roller tables, there are oil cylinders, also distributed in the same interval, perfectly aiming on the other side leadscrew, for pushing and adjusting linearity of plates, if there exist slant placement of plates;
4) This can fully guarantee correct position of sheet metal during its sending forward, especially completed joint steel plate with long length;
2. Acting Unit (The above 2nd Photo):
Sending forward steel plates through mechanical main frame of Steel Plate Butt Joining Welding Machine, is fulfilled with 2 pieces of transmission rollers, which are driven with A.C. cycloidal motor;
The above 3rd photo:
1) Top surface of copper cushions should be flush with top surface of input/ output roller tables. There is limit switch on copper pads elevation unit, applicable for different thickness of steel plates;
2) Besides, there is interlock between height of copper cushion and conveyors: If top surface of copper pads is higher than top surface of roller tables, conveyors will not work;
The above 4th Photo:
1) There is also interlock between function units (Flame triple cutting torch/ welding complex) and input/ output conveyors:
2) Flame triple cutting and melt-thru welding will not in force simultaneously;
3) If either function group is in operation, steel plates can not be moved forward or backward on roller tables of conveyors.
The above 1st Photo:
Where: During melt-thru butt welding, steel plates are pressed firmly onto copper cushion array; Here copper cushion has 2 functions:
1) The bottom layer welding flux on copper pads holds on the 2 pieces of steel plates;
2) Butt welding seam formation: Copper pads help on melt-thru butt welding come into being. With double layers of welding flux, together with cooling water heat dissipation tubes going through inside copper cushion;
3) Butt welding circuit earthen: The grounding cables of butt welding are connected onto press blocks of copper pads directly, guaranteeing on reliable grounding of welding cables;
The above 2nd Photo:
1) When not in butt welding, copper blocks are lowered down to its original bottom position. This can also provide sufficient space for steel plates send in;
2) After steel plates are sent to butt welding table, copper blocks will be lifted up under worm gear motor drive;
3) To cater on different thickness of sheet metal, there are top and bottom limit switches installed along vertical stroke of copper pads;
The above 3rd Photo: You can identify the blue color water tubes that were about to be inserted into and pulled through the entire length of copper cushions, by way of lateral through holes;
The above 4th Photo:
1) During melt-thru butt welding, steel plates will be laid right above copper blocks;
2) Firmly clamping steel plates is secured with black color blocks, which are distributed in regular interval along the entire length of copper pads (Butt welding work table);
3) Heavy drive force: These black pressing blocks are driven with 2 arrays of oil cylinders, which are installed inside V slot of welding table, and swing 0° ~ 90° in phase, to clamp on steel plates along its entire welding seam length.
Significance: Precise position of welding torch directly determines on performance level of melt-thru butt welding:
The above 1st Photo:
According to thickness of joint sheet metal, welding torch elevation is fulfilled in 2 stages:
1) First: High speed descends under motor drive;
2) Second: Precisely adjust in inching mode along precise cross slide. This is accomplished with manual control;
The above 2nd Photo:
1) In the process of melt-thru butt welding, there is a laser light spot, moving ahead of welding torch tip:
2) This moving red color laser spot is for indicating on correct position of welding seam, to guide on welding torch movement, and help operator checking on proper trace of butt welding torch:
a) If laser light spot falls perfectly onto butt welding seam, this means welding torch moves in correct path;
b) If laser light spot deviates from butt welding seam, this means welding torch should be adjusted in reverse direction;
The above 3rd Photo:
1) The laser tracking projector and its white color pushbutton;
2) The welding wire feeder and its managing knacks, for selecting on proper diameter of welding wire;
3) The welding wire straining condition modulating unit;
4) The welding flux conveying and recycling tubes;
5) Work lamp that illuminates on butt welding zone, deep in V slot of welding bench;
The above 4th Photo:
Dynamic coordination of all the above introduced working elements during operation.


