LHE12 Gantry Type BOX Beam Submerged Arc Welding Machine

A. Station of LHE12 BOX Beam Welding Machine in Production Line:

1. At EOL (End of line) station on BOX Beam Production Line, SAW (Submerged arc welding) completes series of welding, following:

1) GZ12/GZ15 internal baffle assembly and tack welding;

2) UBZ12 U Beam BOX Beam assembly and CO₂ welding;

3) XD15/XSD12 Internal baffle electroslag welding;

4) XQ12 gas shielded back welding on assembled BOX;

2. Now we come to the final step of finished SAW welding, also the final critical step in the process of BOX Beam production. The BOX Beam going through this machine, can be viewed as finished BOX Beam.

B. Choice on BOX Beam Submerged Arc Welding Machine:

1. Two Major Types: Based on machine structure, there are two types of BOX Beam SAW Machine to choose from:

1) Gantry structure: The LHE12 model here;

2) Cantilever type: The LHC12 model;

In this section we discuss on gantry structure machine, and in the next section we will discuss on cantilever structure machine;

So, when to select LHE12 gantry structure, when to select LHC12 cantilever structure?

2. Common Points: Both types of BOX Beam Welder machine share the same:

1) Welding Job: SAW technique and operating process;

2) Configuration: One set of the machine is equipped with two sets of SAW units;

3. Difference between 2 Types of BOX Beam Gantry Welding Machine:

1) Structure: As can be observed from attached picture, the gantry type machine “looks more stable” during SAW welding, compared with cantilever structure LHC12, thanks to its structure;

2) Operation Convenience: While the cantilever type LHC12 model, it has the half open structure, which is easy for BOX Beam loading in, turning and transferring;

3) Where to Use: This is the reason that, the LHC12 cantilever structure BOX Beam Welding Machine is more often applied in automatic line; while the LHE12 gantry structure machine is more often worked in semi-automatic line, or worked as an individual equipment on BOX SAW welding. This can also be identified in attached picture of the two types of machines;

4. Quantity of Machine: For fulfilling SAW welding task on BOX Beam production line, either gantry type LHE12 model, or cantilever structure LHC12 model, all need to be installed with two sets. This is because in one of BOX Beam, there are totally 4 pieces of welding seam need to be completed.

C. Technical Features of LHE12 BOX Beam Gantry Welding Machine:

1. SAW Welding Technique: In the field of BOX Beam submerged arc welding, it is adopted with technique of tandem arc, or in some cases triple arc. So, BOX Beam SAW welding belongs to large current SAW;

2. Two Degrees of Freedom in LHE12 BOX Beam SAW Machine:

1) The welding arm, which is fit with SAW welding head, can move both horizontally and vertically, making the SAW head directing at welding seam during work, and accommodating various sizes of BOX Beam;

2) The welding arm movement is powered with A.C. motor, and transmitted with gear and rack (Please check attached picture), fully guaranteeing on positioning accuracy of the SAW welding torch;

3. SAW Welding Auxiliary Unit in LHE12 BOX Beam Welder Machine:

1) Welding Quality Assurance: There is pneumatic drive mechanical type welding arc tracing unit, which is installed on the welding arm, fulfilling the duty of welding seam correct tracking;

2) Automatic welding flux conveying and recycling unit serves as another important welding supporting unit on SAW;

4. Operation on LHE12 BOX Beam Submerged Arc Welding Machine:

1) Workpiece Laying: The BOX Beam is laid on input and output conveyors roller table. During SAW welding, it is in stationary condition;

2) SAW Welding Operation: With the gantry moving along the rail in adjustable SAW welding speed, automatic SAW is carried out in the machine, on the BOX Beam;

3) Gantry Movement Double Drive: To fully guarantee its stable running, the gantry moving is double drive, which means, both sides of the gantry have A.C. motors for driving;

4) SAW Welding Speed: The gantry moving speed, which is also SAW welding speed on BOX Beam, is controlled with A.C. inverter.

D. Put into Use on LHE12 BOX Beam SAW Machine:

At customer site, the complete set of LHE12 BOX Beam Gantry Welding Machine is arranged as below:

1. Overall Arrangement: The gantry frame moves on rails. The rails are leveled and tightened into workshop floor; Workpiece rack is put beneath the gantry and secured into workshop also;

2. Welding system of this machine, including:

1) SAW welding power supply;

2) SAW welding flux recovery unit;

3) SAW welding wire feeder,

Are put on the overhead platform on the top of the moving gantry;

3. Operation Station: There are operating stations at both sides of the moving gantry, please check the attached photo. During work, operator can stand on this station, which is surrounded with guardrail;

4. Operating panel of the LHE12 BOX Beam Welder machine, together with control consoles of SAW power supply, are installed in the same location on the columns of the moving gantry, close at hand for operator’s job.

E. Parameters of LHE12 Gantry Moving BOX Beam Welder Machine: