1. 了解公司的實力，是否為自主研發(fā)生產(chǎn)，有無技術實力保障，為以后的設備維護，設備的檢測、校準，系統(tǒng)的升級以及能否買到設備的配件提供保障，解決用戶的后顧之憂。
2. 了解有無售后服務以及相關的服務措施，就近有無服務網(wǎng)點或無就近服務網(wǎng)點的快速解決方案，以及相關的應急措施。
3. 一臺合格的設備基本的三要素“壓力，時間，溫度”是否精準，顯示值與實際輸出值要匹配，是否滿足國標要求。（焊接總壓力等于拖動壓力加理論的焊接壓力；卷邊時間、吸熱時間，切換時間，漸升時間、冷卻時間要滿足要求；加熱板的表面溫差小于等于正負3度）作為生產(chǎn)廠家都有相關的檢測壓力、溫度的儀表，如若是到廠家去選購設備可以提出讓設備生產(chǎn)商現(xiàn)場演示這三要素是如何檢測、校準的方法。
4. 注意在抽取加熱板后的漸升對接階段油缸的動作是否是緩慢的，這也是保證一個合格焊口的重要階段，如果過快就會對焊口造成撞擊形成假焊。
5. 設備的油缸截面積標識是否在機身上標明，或在使用說明書中找到，這是計算焊接壓力是否與國標相符的重要參數(shù)，也是檢驗一個合格的生產(chǎn)商是否真正了解焊接工藝的真?zhèn)巍?/div>
6. 全自動焊機的可更換的卡瓦數(shù)多為3層，這也是國標要求，如果是多層卡瓦的組合就保證不了焊接的質(zhì)量?？ㄍ叩膶訑?shù)越多造成的累積誤差就越大，作用在焊口上的壓力就損失越大。
7. 焊機是否具有溫度補償，在線實時監(jiān)測輸出壓力，出現(xiàn)實際輸出與參數(shù)不符的情況報警提示等功能。
8. 一個合格焊口的外觀要具有沿管材整個外圓周平滑對稱的焊環(huán)，焊環(huán)應具有一定的對稱性和對正性。燃氣管道按照以下幾何尺寸控制成環(huán)的大小，可以保證焊口的質(zhì)量。
環(huán)的寬度=（0.35-0.45）*壁厚
環(huán)的高度=（0.2-0.25）*壁厚
環(huán)縫的高度=（0.1-0.2）*壁厚
9.設備的價格方面，現(xiàn)在有3萬到十幾萬不等，市場上有原裝進口的，也有合資組裝的產(chǎn)品，國產(chǎn)的全自動也有好幾家已經(jīng)做出來了。產(chǎn)品價格上看差異很大。在選擇什么價位的焊機時應把設備本身輸出精度放在首位，如果參數(shù)不準的話就失去了用全自動焊機的意義了。然后再比較用料及液壓閥門、傳感器、控制系統(tǒng)的區(qū)別。例如：一臺壓力傳感器的價格就從幾百到幾千不等。用料及標準件的選材上就直接影響到系統(tǒng)的穩(wěn)定性、輸出的精度及使用壽命。
10. 全自動的產(chǎn)品，程序化的產(chǎn)品一般出現(xiàn)故障，現(xiàn)場使用者都不能維修。故不能為了省點錢，而購買了質(zhì)量不好，系統(tǒng)不穩(wěn)定的機器，否則日后你花在維修與誤工的損失肯定比差價大。目前多數(shù)用戶還在使用液壓熱熔焊機，焊接的質(zhì)量就完全靠機器的質(zhì)量與操作工人的技術了。
1. Understand the strength of the company, whether it is independent research and development and production, whether it has technical strength guarantee, and provide guarantee for future equipment maintenance, equipment testing, calibration, system upgrading and whether it can buy equipment accessories, so as to solve users' worries.
2. Know whether there is after-sales service and relevant service measures, whether there is a service outlet nearby or a quick solution without a service outlet nearby, and relevant emergency measures.
3. Whether the three basic elements "pressure, time and temperature" of a qualified equipment are accurate, whether the displayed value matches the actual output value, and whether they meet the requirements of the national standard. (the total welding pressure is equal to the drag pressure plus the theoretical welding pressure; the crimping time, heat absorption time, switching time, gradual rise time and cooling time shall meet the requirements; the surface temperature difference of the heating plate shall be less than or equal to plus or minus 3 degrees) as the manufacturer, there are relevant instruments to detect the pressure and temperature. If you go to the manufacturer to purchase the equipment, you can propose to let the equipment manufacturer demonstrate these three aspects on site The key element is how to detect and calibrate.
4. Pay attention to whether the action of oil cylinder is slow in the gradually rising butt joint stage after the heating plate is extracted, which is also an important stage to ensure a qualified weld joint. If it is too fast, it will cause impact on the weld joint and form false welding.
5. Whether the cross-sectional area mark of the oil cylinder of the equipment is marked on the machine body or found in the operation manual is an important parameter for calculating whether the welding pressure is consistent with the national standard, and also for checking whether a qualified manufacturer really understands the authenticity of the welding process.
6. The maximum number of replaceable slips of full-automatic welding machine is 3 layers, which is also the national standard requirement. If the combination of multi-layer slips is used, the welding quality cannot be guaranteed. The more layers of slips, the greater the accumulated error and the greater the pressure loss on the weld.
7. Whether the welding machine has the functions of temperature compensation, online real-time monitoring of output pressure, alarm prompt in case of actual output inconsistent with parameters, etc.
8. The appearance of a qualified welding joint shall be smooth and symmetrical along the whole outer circumference of the pipe, and the welding ring shall have certain symmetry and alignment. The gas pipeline shall be controlled to form a ring according to the following geometric dimensions to ensure the quality of the welding joint.
Ring width = (0.35-0.45) * wall thickness
Ring height = (0.2-0.25) * wall thickness
Height of girth joint = (0.1-0.2) × wall thickness
9. In terms of the price of the equipment, there are now 30000 to over 100000 yuan. There are imported products with original packaging, joint-venture assembled products in the market, and several domestic full-automatic products have been made. The price of products varies greatly. When choosing the welding machine of what price, the output accuracy of the equipment itself should be put in the first place. If the parameters are not correct, the significance of using the full-automatic welding machine will be lost. Then compare the difference between material and hydraulic valve, sensor and control system. For example, the price of a pressure sensor varies from hundreds to thousands. The selection of materials and standard parts directly affects the stability of the system, the accuracy of output and the service life.
10. Automatic products and programmed products generally fail, and field users cannot repair them. Therefore, you can't buy machines with poor quality and unstable system in order to save money. Otherwise, the cost of maintenance and missed work will be greater than the difference in price. At present, most users are still using hydraulic hot-melt welding machine, and the quality of welding depends entirely on the quality of the machine and the technology of the operator.
