LHD1500 Model Box Gantry Traveling Pipe Back Welding Machine

1.       Outline on Usage and Operation of LHD1500 Pipe Back Welding Machine:

1)       LHD model Automatic Pipe Back Welding Machine is a kind of Pipe Welding Machine, which is used for carrying out longitudinal seam CO₂ back welding, on medium to large diameter welding pipes;

2)       The workpiece just completed CO₂ back welding from this Large Scale Pipe Back Welding Machine is shown as below: (Fig.1)

3)       As can be seen from the above photo, during working of the Pipe Welding Equipment, the welding seam is in the position of 12 o’clock, and welding torch faces downward for operation. This is the optimum welding position in terms of acquiring ideal outcome on both quality and ergonomics, guaranteeing satisfactory performance and productivity of the Pipe Back Welding Machine.

2.       Role of LHD1500 Pipe Back Welding Machine in Welding Pipe Production:

1)       In the process route of SAW (Submerged arc welding) Longitudinal Seam Pipe Production, LHD model Pipe Back Welding Machine is a necessary and indispensable step, situated following Pipe Tack Welding Machine, and preceding to SAW Pipe Welding Machine;

2)       All the above-listed Pipe Welding Machine form up an important branch, in the product family of Welding Equipment;

3)       One of the preconditions on workpieces for this Pipe Back Welding Machine is, the steel plates for being bent into pipe need to be beveled ahead of time, to make welding groove for the subsequent welding: (Fig.2)

3.       Structure and Working Principle of LHD1500 Pipe Longitudinal Seam Welding Machine:

1)       General Layout: The general arrangement on LHD Pipe Longitudinal Welding Machine at customer site is shown in the attached 3^rd sketch. It works in the way of stationary workpiece, which is laid on a group of V-shape supporting rack, plus moving welding torch;

2)       How to Perform Weld: The welding torch and its positioning carriage is installed on the box gantry beam of this Pipe Welding Equipment. During operation of the Pipe Back Welding Machine, the box gantry moves along the 15m long rails in welding speed, implementing CO₂ back welding;

3)       Welding Speed Control: Same as other types of automatic Welding Equipment, the welding speed of this Heavy duty Pipe Back Welding Machine, which is also the mechanical box gantry traveling speed, is controlled by means of VFD (Variable frequency drive) inverter, and displayed in digital display, on operating panel;

4)       Welding Torch Position Management: The position control of welding torch is manipulated by means of its high precision cross slides, shown as below, and checked with laser generator: (Fig.3)

4.       Welding Supporting Unit in LHD1500 Pipe Back Welding Machine:

The technical characteristics of this Pipe Longitudinal Seam Welding Machine call for 2 types of necessary welding supporting unit, to be introduced in the machine:

1)       Welding Swing Unit in the Pipe Back Welding Machine:

a)       Please check below photo. Its function is to deliver broad range of welding seam, which is the basic requirement in Pipe Back Welding Machine. Specifications of this unit please check next segment: (Fig.4)

b)      This welding swing unit is installed on the upper section of the welding torch carriage, shown as below: (Fig.5)

c)       This welding swing unit controls swing range of the welding torch during operation, which equals to the welding seam width produced from the Pipe Back Welding Machine. This unit works in digital manner;

2)       Water Cooling Unit in the Pipe Back Welding Machine:

a)       With welding mode of continuous CO₂ adopted, the welding torch in this Pipe Longitudinal Seam Welding Machine should be equipped with water cooling system. The reason is, under the welding mode of continuous CO₂ welding, welding torch will grow over heating after running certain period of time, which deteriorates its performance;

b)      Water cooling unit is composed of specifically designed water cooling welding torch, corresponding cable line, and red color water tank, located on lateral frame of the Pipe Back Welding Machine: (Fig.6)

5.       Technical Parameters of LHD Heavy duty Pipe Back Welding Machine:

Below are technical specifications of this Pipe Longitudinal Seam Welding Machine: